I'm trying to make a program using a webcam that replaces you, the user, with a videoclip while the background stays what it is.  So far I have made this:

import processing.video.*;
Movie myMovie;

void setup () {
 size(720, 480, P3D);
 myMovie = new Movie(this, "nigara10sd.mov");
 myMovie.loop();
}

void movieEvent(Movie movie) {
 movie.read();
}

void draw() {
 image(myMovie, 0, 0);
 background(#FFFFFF);
}

Where "nigara10sd.mov" is is the name of the videoclip that will be replacing the user.  As you can see I've put a white background over the top so the video playing underneath won't be revealed until the user steps in front of the webcam.  

I've found a tutorial where the background is replaced with an image so the user looks like their in a different location, but i kinda want to do the opposite and replace the user with the background, in this case a video not an image, instead.

Hope I haven't confused anyone.  Any help would be appreciated!