Track objects in video - python

I have an black and white video output with some moving objects and noise. I need to have a python script to track the objects and ignore the noise using several parameters: - distance between dots (minimum and maximum value using size of the object and distance between dots) - angle (my moving objects have smooth curved trajectories, I need to remove too straight trajectories and too eratic trajectories) - trajectory lenght (remove short timed and short lenght trajectories) A last, the script must be able to track the object even if it diseapears during several frames. the output must be an array with: - one row per trajectory - for each trajectory, store x,y,area,time of each dot and trajectory lenght, sinuosity - 500 rows - each new row push out the last one I also need an output video displaying the tracks. The computational speed is realy important, I need someting running in few ms for each frame, without multitherading.