Tracking movement to change color?

Hi y’all,

I am hoping to setup a simple installation that has a camera in the ceiling pointing down to detect movement, then that changes the color of a DMX colorwash in the space. So every time you move it changes the color in the room, and the speed of movement is applied to the speed of the color change.

What is the best tracking node to use for this?

I know this is a fairly simple system but I was hoping someone might be able to show me how to do this because I have never used any tracking yet!

Many thanks.