Use kinect depth map as input?

I'm a 3D animator with no experience in Unity (just Cinema 4D and stuff). Before I try to learn how to do it, I need some help to get started :)

So I'm trying to make this kind of system with kinect, beamer and some stretched projection fabric:

if user touches the stretched fabric -> animations start from this point(s).

So, I understand that there's a kinect plugin and it retrieves somehow the depth map. My question is how to take the informations from the depth map to take and take the coordinates of the brightest points. Preferably vector from the darkest point to the brightest (it must have a limit - the stretched plane would be fixed grey value)

Ok, hope I made it clear :/

Thansks for the response and cheers :) johnalabama