after background subtraction how to track certain object in masked area?

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I have implemented background subtraction code and it works fine but after that how could I make use of the generated mask (to decrease the processing needed )to follow single object that I have its image before. I tried FAST with Flann matcher but it keep giving wrong matches!

https://i.stack.imgur.com/91mPc.png

https://i.stack.imgur.com/cBfyL.png

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