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image(video, 0, 0);

import processing.video.*;
Capture video;

void setup()  {
  size(640, 480);
  video = new Capture(this, width, height, 30);
  video.start();
}

void draw() {
  if (video.available()) {
    video.read();
  }
  
  image(video, 0, 0);
}