diff --git a/modules/bgsegm/include/opencv2/bgsegm.hpp b/modules/bgsegm/include/opencv2/bgsegm.hpp
index 011592a44..8ace5d9a5 100644
--- a/modules/bgsegm/include/opencv2/bgsegm.hpp
+++ b/modules/bgsegm/include/opencv2/bgsegm.hpp
@@ -196,8 +196,8 @@ class CV_EXPORTS_W BackgroundSubtractorCNT  : public BackgroundSubtractor
 {
 public:
     // BackgroundSubtractor interface
-    CV_WRAP virtual void apply(InputArray image, OutputArray fgmask, double learningRate=-1) = 0;
-    CV_WRAP virtual void getBackgroundImage(OutputArray backgroundImage) const = 0;
+    CV_WRAP virtual void apply(InputArray image, OutputArray fgmask, double learningRate=-1) CV_OVERRIDE = 0;
+    CV_WRAP virtual void getBackgroundImage(OutputArray backgroundImage) const CV_OVERRIDE = 0;
 
     /** @brief Returns number of frames with same pixel color to consider stable.
     */
@@ -255,9 +255,9 @@ class CV_EXPORTS_W BackgroundSubtractorGSOC : public BackgroundSubtractor
 {
 public:
     // BackgroundSubtractor interface
-    CV_WRAP virtual void apply(InputArray image, OutputArray fgmask, double learningRate=-1) = 0;
+    CV_WRAP virtual void apply(InputArray image, OutputArray fgmask, double learningRate=-1) CV_OVERRIDE = 0;
 
-    CV_WRAP virtual void getBackgroundImage(OutputArray backgroundImage) const = 0;
+    CV_WRAP virtual void getBackgroundImage(OutputArray backgroundImage) const CV_OVERRIDE = 0;
 };
 
 /** @brief Background Subtraction using Local SVD Binary Pattern. More details about the algorithm can be found at @cite LGuo2016
@@ -266,9 +266,9 @@ class CV_EXPORTS_W BackgroundSubtractorLSBP : public BackgroundSubtractor
 {
 public:
     // BackgroundSubtractor interface
-    CV_WRAP virtual void apply(InputArray image, OutputArray fgmask, double learningRate=-1) = 0;
+    CV_WRAP virtual void apply(InputArray image, OutputArray fgmask, double learningRate=-1) CV_OVERRIDE = 0;
 
-    CV_WRAP virtual void getBackgroundImage(OutputArray backgroundImage) const = 0;
+    CV_WRAP virtual void getBackgroundImage(OutputArray backgroundImage) const CV_OVERRIDE = 0;
 };
 
 /** @brief This is for calculation of the LSBP descriptors.
diff --git a/modules/bgsegm/src/bgfg_gaussmix.cpp b/modules/bgsegm/src/bgfg_gaussmix.cpp
index 9e9d448da..d6c167689 100644
--- a/modules/bgsegm/src/bgfg_gaussmix.cpp
+++ b/modules/bgsegm/src/bgfg_gaussmix.cpp
@@ -69,7 +69,7 @@ static const double defaultVarThreshold = 2.5*2.5;
 static const double defaultNoiseSigma = 30*0.5;
 static const double defaultInitialWeight = 0.05;
 
-class BackgroundSubtractorMOGImpl : public BackgroundSubtractorMOG
+class BackgroundSubtractorMOGImpl CV_FINAL : public BackgroundSubtractorMOG
 {
 public:
     //! the default constructor
@@ -102,7 +102,7 @@ public:
     }
 
     //! the update operator
-    virtual void apply(InputArray image, OutputArray fgmask, double learningRate=0);
+    virtual void apply(InputArray image, OutputArray fgmask, double learningRate=0) CV_OVERRIDE;
 
     //! re-initiaization method
     virtual void initialize(Size _frameSize, int _frameType)
@@ -122,24 +122,24 @@ public:
         bgmodel = Scalar::all(0);
     }
 
-    virtual void getBackgroundImage(OutputArray) const
+    virtual void getBackgroundImage(OutputArray) const CV_OVERRIDE
     {
         CV_Error( Error::StsNotImplemented, "" );
     }
 
-    virtual int getHistory() const { return history; }
-    virtual void setHistory(int _nframes) { history = _nframes; }
+    virtual int getHistory() const CV_OVERRIDE { return history; }
+    virtual void setHistory(int _nframes) CV_OVERRIDE { history = _nframes; }
 
-    virtual int getNMixtures() const { return nmixtures; }
-    virtual void setNMixtures(int nmix) { nmixtures = nmix; }
+    virtual int getNMixtures() const CV_OVERRIDE { return nmixtures; }
+    virtual void setNMixtures(int nmix) CV_OVERRIDE { nmixtures = nmix; }
 
-    virtual double getBackgroundRatio() const { return backgroundRatio; }
-    virtual void setBackgroundRatio(double _backgroundRatio) { backgroundRatio = _backgroundRatio; }
+    virtual double getBackgroundRatio() const CV_OVERRIDE { return backgroundRatio; }
+    virtual void setBackgroundRatio(double _backgroundRatio) CV_OVERRIDE { backgroundRatio = _backgroundRatio; }
 
-    virtual double getNoiseSigma() const { return noiseSigma; }
-    virtual void setNoiseSigma(double _noiseSigma) { noiseSigma = _noiseSigma; }
+    virtual double getNoiseSigma() const CV_OVERRIDE { return noiseSigma; }
+    virtual void setNoiseSigma(double _noiseSigma) CV_OVERRIDE { noiseSigma = _noiseSigma; }
 
-    virtual void write(FileStorage& fs) const
+    virtual void write(FileStorage& fs) const CV_OVERRIDE
     {
         fs << "name" << name_
            << "history" << history
@@ -148,7 +148,7 @@ public:
            << "noiseSigma" << noiseSigma;
     }
 
-    virtual void read(const FileNode& fn)
+    virtual void read(const FileNode& fn) CV_OVERRIDE
     {
         CV_Assert( (String)fn["name"] == name_ );
         history = (int)fn["history"];
diff --git a/modules/bgsegm/src/bgfg_gmg.cpp b/modules/bgsegm/src/bgfg_gmg.cpp
index 5036f1968..353b8718c 100644
--- a/modules/bgsegm/src/bgfg_gmg.cpp
+++ b/modules/bgsegm/src/bgfg_gmg.cpp
@@ -57,7 +57,7 @@ namespace cv
 namespace bgsegm
 {
 
-class BackgroundSubtractorGMGImpl : public BackgroundSubtractorGMG
+class BackgroundSubtractorGMGImpl CV_FINAL : public BackgroundSubtractorGMG
 {
 public:
     BackgroundSubtractorGMGImpl()
@@ -96,49 +96,49 @@ public:
      * @param image Input image
      * @param fgmask Output mask image representing foreground and background pixels
      */
-    virtual void apply(InputArray image, OutputArray fgmask, double learningRate=-1.0);
+    virtual void apply(InputArray image, OutputArray fgmask, double learningRate=-1.0) CV_OVERRIDE;
 
     /**
      * Releases all inner buffers.
      */
     void release();
 
-    virtual int getMaxFeatures() const { return maxFeatures; }
-    virtual void setMaxFeatures(int _maxFeatures) { maxFeatures = _maxFeatures; }
+    virtual int getMaxFeatures() const CV_OVERRIDE { return maxFeatures; }
+    virtual void setMaxFeatures(int _maxFeatures) CV_OVERRIDE { maxFeatures = _maxFeatures; }
 
-    virtual double getDefaultLearningRate() const { return learningRate; }
-    virtual void setDefaultLearningRate(double lr) { learningRate = lr; }
+    virtual double getDefaultLearningRate() const CV_OVERRIDE { return learningRate; }
+    virtual void setDefaultLearningRate(double lr) CV_OVERRIDE { learningRate = lr; }
 
-    virtual int getNumFrames() const { return numInitializationFrames; }
-    virtual void setNumFrames(int nframes) { numInitializationFrames = nframes; }
+    virtual int getNumFrames() const CV_OVERRIDE { return numInitializationFrames; }
+    virtual void setNumFrames(int nframes) CV_OVERRIDE { numInitializationFrames = nframes; }
 
-    virtual int getQuantizationLevels() const { return quantizationLevels; }
-    virtual void setQuantizationLevels(int nlevels) { quantizationLevels = nlevels; }
+    virtual int getQuantizationLevels() const CV_OVERRIDE { return quantizationLevels; }
+    virtual void setQuantizationLevels(int nlevels) CV_OVERRIDE { quantizationLevels = nlevels; }
 
-    virtual double getBackgroundPrior() const { return backgroundPrior; }
-    virtual void setBackgroundPrior(double bgprior) { backgroundPrior = bgprior; }
+    virtual double getBackgroundPrior() const CV_OVERRIDE { return backgroundPrior; }
+    virtual void setBackgroundPrior(double bgprior) CV_OVERRIDE { backgroundPrior = bgprior; }
 
-    virtual int getSmoothingRadius() const { return smoothingRadius; }
-    virtual void setSmoothingRadius(int radius) { smoothingRadius = radius; }
+    virtual int getSmoothingRadius() const CV_OVERRIDE { return smoothingRadius; }
+    virtual void setSmoothingRadius(int radius) CV_OVERRIDE { smoothingRadius = radius; }
 
-    virtual double getDecisionThreshold() const { return decisionThreshold; }
-    virtual void setDecisionThreshold(double thresh) { decisionThreshold = thresh; }
+    virtual double getDecisionThreshold() const CV_OVERRIDE { return decisionThreshold; }
+    virtual void setDecisionThreshold(double thresh) CV_OVERRIDE { decisionThreshold = thresh; }
 
-    virtual bool getUpdateBackgroundModel() const { return updateBackgroundModel; }
-    virtual void setUpdateBackgroundModel(bool update) { updateBackgroundModel = update; }
+    virtual bool getUpdateBackgroundModel() const CV_OVERRIDE { return updateBackgroundModel; }
+    virtual void setUpdateBackgroundModel(bool update) CV_OVERRIDE { updateBackgroundModel = update; }
 
-    virtual double getMinVal() const { return minVal_; }
-    virtual void setMinVal(double val) { minVal_ = val; }
+    virtual double getMinVal() const CV_OVERRIDE { return minVal_; }
+    virtual void setMinVal(double val) CV_OVERRIDE { minVal_ = val; }
 
-    virtual double getMaxVal() const  { return maxVal_; }
-    virtual void setMaxVal(double val)  { maxVal_ = val; }
+    virtual double getMaxVal() const CV_OVERRIDE { return maxVal_; }
+    virtual void setMaxVal(double val) CV_OVERRIDE { maxVal_ = val; }
 
-    virtual void getBackgroundImage(OutputArray backgroundImage) const
+    virtual void getBackgroundImage(OutputArray backgroundImage) const CV_OVERRIDE
     {
         backgroundImage.release();
     }
 
-    virtual void write(FileStorage& fs) const
+    virtual void write(FileStorage& fs) const CV_OVERRIDE
     {
         fs << "name" << name_
         << "maxFeatures" << maxFeatures
@@ -152,7 +152,7 @@ public:
         // we do not save minVal_ & maxVal_, since they depend on the image type.
     }
 
-    virtual void read(const FileNode& fn)
+    virtual void read(const FileNode& fn) CV_OVERRIDE
     {
         CV_Assert( (String)fn["name"] == name_ );
         maxFeatures = (int)fn["maxFeatures"];
@@ -323,7 +323,7 @@ public:
     {
     }
 
-    void operator() (const Range& range) const;
+    void operator() (const Range& range) const CV_OVERRIDE;
 
 private:
     Mat frame_;
diff --git a/modules/bgsegm/src/bgfg_gsoc.cpp b/modules/bgsegm/src/bgfg_gsoc.cpp
index 8b5c76e66..f81eca9c8 100644
--- a/modules/bgsegm/src/bgfg_gsoc.cpp
+++ b/modules/bgsegm/src/bgfg_gsoc.cpp
@@ -364,7 +364,7 @@ private:
 public:
     ParallelLocalSVDValues(const Size& _sz, Mat& _localSVDValues, const Mat& _frameGray) : sz(_sz), localSVDValues(_localSVDValues), frameGray(_frameGray) {};
 
-    void operator()(const Range &range) const {
+    void operator()(const Range &range) const CV_OVERRIDE {
         for (int i = range.start; i < range.end; ++i)
             for (int j = 1; j < sz.width - 1; ++j) {
                 localSVDValues.at<float>(i, j) = localSVD(
@@ -387,7 +387,7 @@ private:
 public:
     ParallelFromLocalSVDValues(const Size& _sz, Mat& _desc, const Mat& _localSVDValues, const Point2i* _LSBPSamplePoints) : sz(_sz), desc(_desc), localSVDValues(_localSVDValues), LSBPSamplePoints(_LSBPSamplePoints) {};
 
-    void operator()(const Range &range) const {
+    void operator()(const Range &range) const CV_OVERRIDE {
         for (int index = range.start; index < range.end; ++index) {
             const int i = index / sz.width, j = index % sz.width;
             int& descVal = desc.at<int>(i, j);
@@ -455,7 +455,7 @@ void BackgroundSubtractorLSBPDesc::compute(OutputArray desc, const Mat& frame, c
     computeFromLocalSVDValues(desc, localSVDValues, LSBPSamplePoints);
 }
 
-class BackgroundSubtractorGSOCImpl : public BackgroundSubtractorGSOC {
+class BackgroundSubtractorGSOCImpl CV_FINAL : public BackgroundSubtractorGSOC {
 private:
     Ptr<BackgroundModelGSOC> backgroundModel;
     Ptr<BackgroundModelGSOC> backgroundModelPrev;
@@ -492,14 +492,14 @@ public:
                                  float noiseRemovalThresholdFacBG,
                                  float noiseRemovalThresholdFacFG);
 
-    CV_WRAP virtual void apply(InputArray image, OutputArray fgmask, double learningRate = -1);
+    CV_WRAP virtual void apply(InputArray image, OutputArray fgmask, double learningRate = -1) CV_OVERRIDE;
 
-    CV_WRAP virtual void getBackgroundImage(OutputArray backgroundImage) const;
+    CV_WRAP virtual void getBackgroundImage(OutputArray backgroundImage) const CV_OVERRIDE;
 
     friend class ParallelGSOC;
 };
 
-class BackgroundSubtractorLSBPImpl : public BackgroundSubtractorLSBP {
+class BackgroundSubtractorLSBPImpl CV_FINAL : public BackgroundSubtractorLSBP {
 private:
     Ptr<BackgroundModelLSBP> backgroundModel;
     Ptr<BackgroundModelLSBP> backgroundModelPrev;
@@ -540,9 +540,9 @@ public:
                                  int minCount
                                 );
 
-    CV_WRAP virtual void apply(InputArray image, OutputArray fgmask, double learningRate = -1);
+    CV_WRAP virtual void apply(InputArray image, OutputArray fgmask, double learningRate = -1) CV_OVERRIDE;
 
-    CV_WRAP virtual void getBackgroundImage(OutputArray backgroundImage) const;
+    CV_WRAP virtual void getBackgroundImage(OutputArray backgroundImage) const CV_OVERRIDE;
 
     friend class ParallelLSBP;
 };
@@ -561,7 +561,7 @@ public:
     ParallelGSOC(const Size& _sz, BackgroundSubtractorGSOCImpl* _bgs, const Mat& _frame, double _learningRate, Mat& _fgMask)
     : sz(_sz), bgs(_bgs), frame(_frame), learningRate(_learningRate), fgMask(_fgMask) {};
 
-    void operator()(const Range &range) const {
+    void operator()(const Range &range) const CV_OVERRIDE {
         BackgroundModelGSOC* backgroundModel = bgs->backgroundModel.get();
         Mat& distMovingAvg = bgs->distMovingAvg;
 
@@ -621,7 +621,7 @@ public:
     ParallelLSBP(const Size& _sz, BackgroundSubtractorLSBPImpl* _bgs, const Mat& _frame, double _learningRate, const Mat& _LSBPDesc, Mat& _fgMask)
     : sz(_sz), bgs(_bgs), frame(_frame), learningRate(_learningRate), LSBPDesc(_LSBPDesc), fgMask(_fgMask) {};
 
-    void operator()(const Range &range) const {
+    void operator()(const Range &range) const CV_OVERRIDE {
         BackgroundModelLSBP* backgroundModel = bgs->backgroundModel.get();
         Mat& T = bgs->T;
         Mat& R = bgs->R;
diff --git a/modules/bgsegm/src/bgfg_subcnt.cpp b/modules/bgsegm/src/bgfg_subcnt.cpp
index 1e2a1a3f6..1638de50e 100644
--- a/modules/bgsegm/src/bgfg_subcnt.cpp
+++ b/modules/bgsegm/src/bgfg_subcnt.cpp
@@ -50,7 +50,7 @@ namespace cv
 namespace bgsegm
 {
 
-class BackgroundSubtractorCNTImpl: public BackgroundSubtractorCNT
+class BackgroundSubtractorCNTImpl CV_FINAL : public BackgroundSubtractorCNT
 {
 public:
 
@@ -60,20 +60,20 @@ public:
                                 bool isParallel);
 
     // BackgroundSubtractor interface
-    virtual void apply(InputArray image, OutputArray fgmask, double learningRate);
-    virtual void getBackgroundImage(OutputArray backgroundImage) const;
+    virtual void apply(InputArray image, OutputArray fgmask, double learningRate) CV_OVERRIDE;
+    virtual void getBackgroundImage(OutputArray backgroundImage) const CV_OVERRIDE;
 
-    int getMinPixelStability() const;
-    void setMinPixelStability(int value);
+    int getMinPixelStability() const CV_OVERRIDE;
+    void setMinPixelStability(int value) CV_OVERRIDE;
 
-    int getMaxPixelStability() const;
-    void setMaxPixelStability(int value);
+    int getMaxPixelStability() const CV_OVERRIDE;
+    void setMaxPixelStability(int value) CV_OVERRIDE;
 
-    bool getUseHistory() const;
-    void setUseHistory(bool value);
+    bool getUseHistory() const CV_OVERRIDE;
+    void setUseHistory(bool value) CV_OVERRIDE;
 
-    bool getIsParallel() const;
-    void setIsParallel(bool value);
+    bool getIsParallel() const CV_OVERRIDE;
+    void setIsParallel(bool value) CV_OVERRIDE;
 
     //! the destructor
     virtual ~BackgroundSubtractorCNTImpl() {}
@@ -185,7 +185,7 @@ struct BGSubtractPixel : public CNTFunctor
     //! the destructor
     virtual ~BGSubtractPixel() {}
 
-    void operator()(Vec4i &vec, uchar currColor, uchar prevColor, uchar &fgMaskPixelRef)
+    void operator()(Vec4i &vec, uchar currColor, uchar prevColor, uchar &fgMaskPixelRef) CV_OVERRIDE
     {
         int &stabilityRef = vec[0];
         int &bgImgRef = vec[3];
@@ -248,7 +248,7 @@ struct BGSubtractPixelWithHistory : public CNTFunctor
         }
     }
 
-    void operator()(Vec4i &vec, uchar currColor, uchar prevColor, uchar &fgMaskPixelRef)
+    void operator()(Vec4i &vec, uchar currColor, uchar prevColor, uchar &fgMaskPixelRef) CV_OVERRIDE
     {
         int &stabilityRef = vec[0];
         int &historyColorRef = vec[1];
@@ -316,7 +316,7 @@ public:
     }
 
     // Iterate rows
-    void operator()(const Range& range) const
+    void operator()(const Range& range) const CV_OVERRIDE
     {
         for (int r = range.start; r < range.end; ++r)
         {