Command line tool to remove image background (chromakey) to evaluate proprietary library -- 2

I would like someone to write piece of software which would trigger that background removal from command line using OpenCV Ideal situation would be to command line tool to accept input and output files to background removal. I would expect this to be an rather easy task for someone who knows what he is doing. I'd prefer OSX to be used, because project compiles with it. With Linux make produced compilation errors, but target would be first to compile this with OSX and then port it to Linux if this works. There are some tools that ports xcode projects to makefiles which eventually will work in linux (ubuntu) as well, but I don't have experience on those. I hope you have.