Define a fix area in Meanshift

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Hi everyone,

I need your help in OpenCV. I'm a student and i actually work in a project which consist to have a little autonomous car. I use Python for the main language programming.

I have some problem with my meanshift. I want when i run the program that the camera fix a area on the floor and stay on this area. Because i would like that the car drive alone following the floor and i don't want that meanshift find another object different from the floor. So the program works well but not optimally for the floor... Have you got a solution or a way to proceed ? (Sorry if my english is not so good)

Thank you !