How Do I Track A Specific Object Out Of Multiple Objects In Opencv?

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C++

OpenCV

I wrote a program to track any moving object from a camera frame using Opencv and c++. The approach that i used is frame differencing and then applying some thresholding to track the moving object. Well, until this part everything works pretty well. Now, my goal is that say i have multiple objects moving around in my camera frame and i want to track single object out of them. So, obviously i tried it with my above approach but the results were not that satisfactory. The reason i wanted to do this is because i can use this for security reasons and any other reasons. I dont want to use color detection or any sort of algorithm which may be brightness/background dependent. I want to come up with a robust system which can help me to track the object i want out of multiple moving objects. So, what kind of approach should i use to accomplish this project? Thanks

** I want to separate a single object from multiple objects and track it. Something like this -https://www.youtube.com/watch?v=fCu4_mhcdJg[^]