samples: apply CV_OVERRIDE/CV_FINAL

samples/cpp/dbt_face_detection.cpp

@@ -24,12 +24,12 @@ class CascadeDetectorAdapter: public DetectionBasedTracker::IDetector
             CV_Assert(detector);
         }
 
-        void detect(const cv::Mat &Image, std::vector<cv::Rect> &objects)
+        void detect(const cv::Mat &Image, std::vector<cv::Rect> &objects) CV_OVERRIDE
         {
             Detector->detectMultiScale(Image, objects, scaleFactor, minNeighbours, 0, minObjSize, maxObjSize);
         }
 
-        virtual ~CascadeDetectorAdapter()
+        virtual ~CascadeDetectorAdapter() CV_OVERRIDE
         {}
 
     private:

samples/cpp/videostab.cpp

@@ -192,7 +192,7 @@ public:
     MotionEstimatorRansacL2Builder(CommandLineParser &command, bool use_gpu, const string &_prefix = "")
         : IMotionEstimatorBuilder(command), gpu(use_gpu), prefix(_prefix) {}
 
-    virtual Ptr<ImageMotionEstimatorBase> build()
+    virtual Ptr<ImageMotionEstimatorBase> build() CV_OVERRIDE
     {
         Ptr<MotionEstimatorRansacL2> est = makePtr<MotionEstimatorRansacL2>(motionModel(arg(prefix + "model")));
 
@@ -245,7 +245,7 @@ public:
     MotionEstimatorL1Builder(CommandLineParser &command, bool use_gpu, const string &_prefix = "")
         : IMotionEstimatorBuilder(command), gpu(use_gpu), prefix(_prefix) {}
 
-    virtual Ptr<ImageMotionEstimatorBase> build()
+    virtual Ptr<ImageMotionEstimatorBase> build() CV_OVERRIDE
     {
         Ptr<MotionEstimatorL1> est = makePtr<MotionEstimatorL1>(motionModel(arg(prefix + "model")));