diff --git a/modules/video/perf/opencl/perf_bgfg_mog2.cpp b/modules/video/perf/opencl/perf_bgfg_mog2.cpp
index f5ddc43d5e..cb9aa456c4 100644
--- a/modules/video/perf/opencl/perf_bgfg_mog2.cpp
+++ b/modules/video/perf/opencl/perf_bgfg_mog2.cpp
@@ -1,8 +1,13 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+
 #include "../perf_precomp.hpp"
 #include "opencv2/ts/ocl_perf.hpp"
 
 #ifdef HAVE_OPENCL
 #ifdef HAVE_VIDEO_INPUT
+#include "../perf_bgfg_utils.hpp"
 
 namespace cvtest {
 namespace ocl {
@@ -13,31 +18,7 @@ typedef tuple<string, int> VideoMOG2ParamType;
 typedef TestBaseWithParam<VideoMOG2ParamType> MOG2_Apply;
 typedef TestBaseWithParam<VideoMOG2ParamType> MOG2_GetBackgroundImage;
 
-static void cvtFrameFmt(vector<Mat>& input, vector<Mat>& output)
-{
-    for(int i = 0; i< (int)(input.size()); i++)
-    {
-        cvtColor(input[i], output[i], COLOR_RGB2GRAY);
-    }
-}
-
-static void prepareData(VideoCapture& cap, int cn, vector<Mat>& frame_buffer)
-{
-    cv::Mat frame;
-    std::vector<Mat> frame_buffer_init;
-    int nFrame = (int)frame_buffer.size();
-    for(int i = 0; i < nFrame; i++)
-    {
-        cap >> frame;
-        ASSERT_FALSE(frame.empty());
-        frame_buffer_init.push_back(frame);
-    }
-
-    if(cn == 1)
-        cvtFrameFmt(frame_buffer_init, frame_buffer);
-    else
-        frame_buffer = frame_buffer_init;
-}
+using namespace opencv_test;
 
 OCL_PERF_TEST_P(MOG2_Apply, Mog2, Combine(Values("gpu/video/768x576.avi", "gpu/video/1920x1080.avi"), Values(1,3)))
 {
@@ -66,23 +47,26 @@ OCL_PERF_TEST_P(MOG2_Apply, Mog2, Combine(Values("gpu/video/768x576.avi", "gpu/v
             mog2->apply(frame_buffer[i], u_foreground);
         }
     }
-    SANITY_CHECK(u_foreground);
+    SANITY_CHECK_NOTHING();
 }
 
-OCL_PERF_TEST_P(MOG2_GetBackgroundImage, Mog2, Combine(Values("gpu/video/768x576.avi", "gpu/video/1920x1080.avi"), Values(3)))
+OCL_PERF_TEST_P(MOG2_GetBackgroundImage, Mog2, Values(
+        std::make_pair<string, int>("gpu/video/768x576.avi", 5),
+        std::make_pair<string, int>("gpu/video/1920x1080.avi", 5)))
 {
     VideoMOG2ParamType params = GetParam();
 
     const string inputFile = getDataPath(get<0>(params));
 
-    const int cn = get<1>(params);
-    int nFrame = 5;
+    const int cn = 3;
+    const int skipFrames = get<1>(params);
+    int nFrame = 10;
 
     vector<Mat> frame_buffer(nFrame);
 
     cv::VideoCapture cap(inputFile);
     ASSERT_TRUE(cap.isOpened());
-    prepareData(cap, cn, frame_buffer);
+    prepareData(cap, cn, frame_buffer, skipFrames);
 
     UMat u_foreground, u_background;
 
@@ -98,6 +82,10 @@ OCL_PERF_TEST_P(MOG2_GetBackgroundImage, Mog2, Combine(Values("gpu/video/768x576
         }
         mog2->getBackgroundImage(u_background);
     }
+#ifdef DEBUG_BGFG
+    imwrite(format("fg_%d_%d_mog2_ocl.png", frame_buffer[0].rows, cn), u_foreground.getMat(ACCESS_READ));
+    imwrite(format("bg_%d_%d_mog2_ocl.png", frame_buffer[0].rows, cn), u_background.getMat(ACCESS_READ));
+#endif
     SANITY_CHECK_NOTHING();
 }
 
diff --git a/modules/video/perf/perf_bgfg_knn.cpp b/modules/video/perf/perf_bgfg_knn.cpp
new file mode 100644
index 0000000000..d9ead09fd9
--- /dev/null
+++ b/modules/video/perf/perf_bgfg_knn.cpp
@@ -0,0 +1,89 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+
+#include "perf_precomp.hpp"
+
+#ifdef HAVE_VIDEO_INPUT
+#include "perf_bgfg_utils.hpp"
+
+namespace opencv_test { namespace {
+
+//////////////////////////// KNN//////////////////////////
+
+typedef tuple<std::string, int> VideoKNNParamType;
+typedef TestBaseWithParam<VideoKNNParamType> KNN_Apply;
+typedef TestBaseWithParam<VideoKNNParamType> KNN_GetBackgroundImage;
+
+PERF_TEST_P(KNN_Apply, KNN, Combine(Values("gpu/video/768x576.avi", "gpu/video/1920x1080.avi"), Values(1,3)))
+{
+    VideoKNNParamType params = GetParam();
+
+    const string inputFile = getDataPath(get<0>(params));
+
+    const int cn = get<1>(params);
+    int nFrame = 5;
+
+    vector<Mat> frame_buffer(nFrame);
+
+    cv::VideoCapture cap(inputFile);
+    ASSERT_TRUE(cap.isOpened());
+    prepareData(cap, cn, frame_buffer);
+
+    Mat foreground;
+
+    TEST_CYCLE()
+    {
+        Ptr<cv::BackgroundSubtractorKNN> knn = createBackgroundSubtractorKNN();
+        knn->setDetectShadows(false);
+        foreground.release();
+        for (int i = 0; i < nFrame; i++)
+        {
+            knn->apply(frame_buffer[i], foreground);
+        }
+    }
+    SANITY_CHECK_NOTHING();
+}
+
+PERF_TEST_P(KNN_GetBackgroundImage, KNN, Values(
+        std::make_pair<string, int>("gpu/video/768x576.avi", 5),
+        std::make_pair<string, int>("gpu/video/1920x1080.avi", 5)))
+{
+    VideoKNNParamType params = GetParam();
+
+    const string inputFile = getDataPath(get<0>(params));
+
+    const int cn = 3;
+    const int skipFrames = get<1>(params);
+    int nFrame = 10;
+
+    vector<Mat> frame_buffer(nFrame);
+
+    cv::VideoCapture cap(inputFile);
+    ASSERT_TRUE(cap.isOpened());
+    prepareData(cap, cn, frame_buffer, skipFrames);
+
+    Mat foreground, background;
+
+    TEST_CYCLE()
+    {
+        Ptr<cv::BackgroundSubtractorKNN> knn = createBackgroundSubtractorKNN();
+        knn->setDetectShadows(false);
+        foreground.release();
+        background.release();
+        for (int i = 0; i < nFrame; i++)
+        {
+            knn->apply(frame_buffer[i], foreground);
+        }
+        knn->getBackgroundImage(background);
+    }
+#ifdef DEBUG_BGFG
+    imwrite(format("fg_%d_%d_knn.png", frame_buffer[0].rows, cn), foreground);
+    imwrite(format("bg_%d_%d_knn.png", frame_buffer[0].rows, cn), background);
+#endif
+    SANITY_CHECK_NOTHING();
+}
+
+}}// namespace
+
+#endif
diff --git a/modules/video/perf/perf_bgfg_mog2.cpp b/modules/video/perf/perf_bgfg_mog2.cpp
new file mode 100644
index 0000000000..92e5d0283f
--- /dev/null
+++ b/modules/video/perf/perf_bgfg_mog2.cpp
@@ -0,0 +1,89 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+
+#include "perf_precomp.hpp"
+
+#ifdef HAVE_VIDEO_INPUT
+#include "perf_bgfg_utils.hpp"
+
+namespace opencv_test { namespace {
+
+//////////////////////////// Mog2//////////////////////////
+
+typedef tuple<std::string, int> VideoMOG2ParamType;
+typedef TestBaseWithParam<VideoMOG2ParamType> MOG2_Apply;
+typedef TestBaseWithParam<VideoMOG2ParamType> MOG2_GetBackgroundImage;
+
+PERF_TEST_P(MOG2_Apply, Mog2, Combine(Values("gpu/video/768x576.avi", "gpu/video/1920x1080.avi"), Values(1,3)))
+{
+    VideoMOG2ParamType params = GetParam();
+
+    const string inputFile = getDataPath(get<0>(params));
+
+    const int cn = get<1>(params);
+    int nFrame = 5;
+
+    vector<Mat> frame_buffer(nFrame);
+
+    cv::VideoCapture cap(inputFile);
+    ASSERT_TRUE(cap.isOpened());
+    prepareData(cap, cn, frame_buffer);
+
+    Mat foreground;
+
+    TEST_CYCLE()
+    {
+        Ptr<cv::BackgroundSubtractorMOG2> mog2 = createBackgroundSubtractorMOG2();
+        mog2->setDetectShadows(false);
+        foreground.release();
+        for (int i = 0; i < nFrame; i++)
+        {
+            mog2->apply(frame_buffer[i], foreground);
+        }
+    }
+    SANITY_CHECK_NOTHING();
+}
+
+PERF_TEST_P(MOG2_GetBackgroundImage, Mog2, Values(
+        std::make_pair<string, int>("gpu/video/768x576.avi", 5),
+        std::make_pair<string, int>("gpu/video/1920x1080.avi", 5)))
+{
+    VideoMOG2ParamType params = GetParam();
+
+    const string inputFile = getDataPath(get<0>(params));
+
+    const int cn = 3;
+    const int skipFrames = get<1>(params);
+    int nFrame = 10;
+
+    vector<Mat> frame_buffer(nFrame);
+
+    cv::VideoCapture cap(inputFile);
+    ASSERT_TRUE(cap.isOpened());
+    prepareData(cap, cn, frame_buffer, skipFrames);
+
+    Mat foreground, background;
+
+    TEST_CYCLE()
+    {
+        Ptr<cv::BackgroundSubtractorMOG2> mog2 = createBackgroundSubtractorMOG2();
+        mog2->setDetectShadows(false);
+        foreground.release();
+        background.release();
+        for (int i = 0; i < nFrame; i++)
+        {
+            mog2->apply(frame_buffer[i], foreground);
+        }
+        mog2->getBackgroundImage(background);
+    }
+#ifdef DEBUG_BGFG
+    imwrite(format("fg_%d_%d_mog2.png", frame_buffer[0].rows, cn), foreground);
+    imwrite(format("bg_%d_%d_mog2.png", frame_buffer[0].rows, cn), background);
+#endif
+    SANITY_CHECK_NOTHING();
+}
+
+}}// namespace
+
+#endif
diff --git a/modules/video/perf/perf_bgfg_utils.hpp b/modules/video/perf/perf_bgfg_utils.hpp
new file mode 100644
index 0000000000..2c37230a09
--- /dev/null
+++ b/modules/video/perf/perf_bgfg_utils.hpp
@@ -0,0 +1,48 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+
+namespace opencv_test {
+
+//#define DEBUG_BGFG
+
+using namespace testing;
+using namespace cvtest;
+using namespace perf;
+
+namespace {
+
+using namespace cv;
+
+static void cvtFrameFmt(std::vector<Mat>& input, std::vector<Mat>& output)
+{
+    for(int i = 0; i< (int)(input.size()); i++)
+    {
+        cvtColor(input[i], output[i], COLOR_RGB2GRAY);
+    }
+}
+
+static void prepareData(VideoCapture& cap, int cn, std::vector<Mat>& frame_buffer, int skipFrames = 0)
+{
+    std::vector<Mat> frame_buffer_init;
+    int nFrame = (int)frame_buffer.size();
+    for (int i = 0; i < skipFrames; i++)
+    {
+        cv::Mat frame;
+        cap >> frame;
+    }
+    for (int i = 0; i < nFrame; i++)
+    {
+        cv::Mat frame;
+        cap >> frame;
+        ASSERT_FALSE(frame.empty());
+        frame_buffer_init.push_back(frame);
+    }
+
+    if (cn == 1)
+        cvtFrameFmt(frame_buffer_init, frame_buffer);
+    else
+        frame_buffer.swap(frame_buffer_init);
+}
+
+}}