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If you already know there is just one circle on your video and it is white, you don't have to convert the frame to HSV. Circle Hough Transformation it's enough. But if there are a lot of noises, you have to optimize your detection playing with your parameters. Take a look at the c++ code here. Maybe it will help you to understand the approach. (I've never used Python, so I can't implement an example for you).
good luck
