Programming through the GPU

So I'm working on a c++ project that uses the OpenCV library and I wanted to use their ocl factions, which to my understandings are image processing functions that work though the GPU.
So after digging a bit through tutorials I heard something about configuring OpenCV using CMake with "WITH_OPENCL=ON". So as someone who isn't familiar to Cmake, is there a way around it? Am I possibly missing something more essential in addition to all this? It sounds logical that choosing your GPU somewhere will be needed for those functions to work. (its possible for a computer to have two GPUs or none?)


I know an explanation for this might be long, but the basic guidelines would be really appreciated because I just know I'm missing something.
As always, thanks in advance
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