Update CMakeLists.txt
Also test for target.
Optimize OpenCL version function BackgroundSubstractionMOG2
Fixed CMake issue with FFMPEG videoio configuration
Use FFMPEG capture only if HAVE_FFMPEG flag is defined.
Merge pull request #3277 from a-wi:CMake_FFMPEG_config_v3
Added performance test for OCL version of HoughLines and HoughLinesP
Move cmake config files too on non-windows hosts.
Merge pull request #3278 from akarsakov:ocl_houghlines_perf_test
Merge pull request #3223 from vbystricky:oclopt_BgSubMOG2
Merge pull request #3216 from xantares:patch-1
naive implementation
second naive implementation
use local memory
block_size=16
add vector 4