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You can use the TBB parallel pipeline with OpenCV to do just that.

I have a post about using it with OpenCV here - https://www.theimpossiblecode.com/blog/faster-opencv-smiles-tbb

TBB has advanced multi threading patterns and tools - some of them used internally by OpenCV (if built with it), and some can be used externally, regardless if OpenCV was built with TBB support.