picture animation

Hy There,
first of all excuse me, I used the search Function but could´nt find anything similar, so my first Action in this Forum was to create a new Topic...sorry for that...but now my problem:

iam involved in a project where we should create a max/jitter Application for Dancers, the idea is that when the Dancer act on a specific point (X and Y Coordinates) the background picture is changing, or better said parts of the picture should rotate, becomin smaller or bigger (depends on the distance of the dancer)

how can i create that?

i managed it to use a patch using my webcam, and work with the outgoing paremeters of me goin left or right...till yet, it just changes the frequency of a sound, but how can i bind a picture in it which changes?

my suggestion is a matrix could it be?

many thx from a desperate Noob ;)