Merge pull request #18869 from anna-khakimova:ak/kalman

* GAPI: Kalman filter stateful kernel

* Applied comments

* Applied comments. Second iteration

* Add overload without control vector

* Remove structure constructor and dimension fields.

* Add sample as test

* Remove visualization from test-sample + correct doxygen comments

* Applied comments.

modules/gapi/test/cpu/gapi_video_tests_cpu.cpp

@@ -111,4 +111,28 @@ INSTANTIATE_TEST_CASE_MACRO_P(WITH_VIDEO(BackgroundSubtractorTestCPU),
                                              Values(-1, 0, 0.5, 1),
                                              Values("cv/video/768x576.avi"),
                                              Values(3)));
+
+INSTANTIATE_TEST_CASE_MACRO_P(KalmanFilterTestCPU,
+                              KalmanFilterTest,
+                              Combine(Values(VIDEO_CPU),
+                                      Values(CV_32FC1, CV_64FC1),
+                                      Values(2,5),
+                                      Values(2,5),
+                                      Values(2),
+                                      Values(5)));
+
+INSTANTIATE_TEST_CASE_MACRO_P(KalmanFilterTestCPU,
+                              KalmanFilterNoControlTest,
+                              Combine(Values(VIDEO_CPU),
+                                      Values(CV_32FC1, CV_64FC1),
+                                      Values(3),
+                                      Values(4),
+                                      Values(3)));
+
+INSTANTIATE_TEST_CASE_MACRO_P(KalmanFilterTestCPU,
+                              KalmanFilterCircleSampleTest,
+                              Combine(Values(VIDEO_CPU),
+                                      Values(CV_32FC1, CV_64FC1),
+                                      Values(5)));
+
 } // opencv_test