Implementation detector and selector for IPP and OpenCL;

IPP can be switched on and off on runtime;

Optional implementation collector was added (switched off by default in CMake). Gathers data of implementation used in functions and report this info through performance TS;

TS modifications for implementations control;

modules/video/src/lkpyramid.cpp

@@ -1096,7 +1096,10 @@ void cv::calcOpticalFlowPyrLK( InputArray _prevImg, InputArray _nextImg,
                       (_prevImg.isUMat() || _nextImg.isUMat()) &&
                       ocl::Image2D::isFormatSupported(CV_32F, 1, false);
     if ( use_opencl && ocl_calcOpticalFlowPyrLK(_prevImg, _nextImg, _prevPts, _nextPts, _status, _err, winSize, maxLevel, criteria, flags/*, minEigThreshold*/))
+    {
+        CV_IMPL_ADD(CV_IMPL_OCL);
         return;
+    }
 
     Mat prevPtsMat = _prevPts.getMat();
     const int derivDepth = DataType<cv::detail::deriv_type>::depth;

modules/video/src/optflowgf.cpp

@@ -1081,7 +1081,10 @@ void cv::calcOpticalFlowFarneback( InputArray _prev0, InputArray _next0,
 {
     bool use_opencl = ocl::useOpenCL() && _flow0.isUMat();
     if( use_opencl && ocl_calcOpticalFlowFarneback(_prev0, _next0, _flow0, pyr_scale, levels, winsize, iterations, poly_n, poly_sigma, flags))
+    {
+        CV_IMPL_ADD(CV_IMPL_OCL);
         return;
+    }
 
     Mat prev0 = _prev0.getMat(), next0 = _next0.getMat();
     const int min_size = 32;