Use a webcam to see AR marker to change projected animation

Ok, so super new to processing and I am trying to figure out a project I would really love to get done. The idea is to have a looped animation projected(about 5 seconds), that changes when an AR marker is shown to an attached webcam. I'd like to have different animations for different markers I have the opencv for processing library installed and assume that is where to begin. I just don't know how to make it happen.

If it helps I have I have the code of the animation i am working with, which right now is controlled by A,W,S.:

int numFrames = 120;
PImage[] images = new PImage[numFrames];
PImage[] left = new PImage[numFrames];
int currentFrame = 0;

void setup(){
  size(263, 410);
  for (int i = 0; i < images.length; i++) {
    String imageName = "Izquierda_idle_" + nf(i, 5) + ".png";
    images[i] = loadImage(imageName);
  }
  frameRate(24);
}

void draw() {
  image(images[currentFrame], 0, 0);
  currentFrame++;
  if(currentFrame >= images.length) {
    currentFrame = 0;
  }
  if (keyPressed) {

    if ((key =='a') || (key == 'A')){
       for (int i = 0; i < images.length; i++) {
    String imageName = "Izquierda_left_" + nf(i, 5) + ".png";
    images[i] = loadImage(imageName);
       }
       println ("left pressed");
    }

     if ((key == 's') || (key == 'S')){
       for (int b = 0; b < images.length; b++) {
     String imageName = "Izquierda_right_" + nf(b, 5) + ".png";
     images[b] = loadImage(imageName);

       }
       println ("right pressed");
     }
        if ((key == 'w') || (key == 'W')){
       for (int w = 0; w < images.length; w++) {
     String imageName = "Izquierda_idle_" + nf(w, 5) + ".png";
     images[w] = loadImage(imageName);

       }
       println ("up pressed");
        }
  }
}

Thanks, Fern