cv.jit.faces face tracking and x/y coordinates

Hi Everyone! Please give any input you see fit,

I have been working with max for almost 6 months now (new to it) and am attempting to develop a Virtual Reality, or rather Augmented Reality interface. I would be happy to explain the specifics of my simplistic approach to the idea if anyone is interested. More importantly I have a simple question which is:

What is the most efficient way to create a set of x-y co-ordinates for face detection by webcam?

the objects cv.jit.faces or the object cv.jit.faces.draw appear to be the most effective face trackers, but how would I go about creating a consistently updating set of outputs for the position of the face relative to the width and height of the matrix created by the webcam?

Thank you very much for any help,

Thomas Campbell