fixed unused function in case of unavailable CUDA
unused function in case of unavailable OpenGL
removed ocl from allmodules list
one more ocl deletion
Merge pull request #2254 from ilya-lavrenov:opengl
Merge pull request #2253 from ilya-lavrenov:cuda
Merge pull request #2255 from ilya-lavrenov:ocl_doc
HOG
perf test
some changes
fixes