cmake: detect Direct 3D 11
core: added DirectX interop implementation (OpenCL) with samples
Added ocl_medianFilter using Transparent API
Fixed trailing whitespace
added cv::gemm to T-API
Fixed medianFilter
Fixed condition for channels
minMaxLoc
some fixes
Merge pull request #1998 from ilya-lavrenov:tapi_gemm
Merge pull request #1992 from ElenaGvozdeva:ocl_medianFilter
Merge pull request #1969 from KonstantinMatskevich:ocl_tapi_minmaxloc
Merge pull request #1917 from alalek:ocl_d3d