1. import processing.video.*;
2. Capture myCapture;
3. void setup()
4. {
5. size(200, 200);
6. myCapture = new Capture(this, width, height, 30);
7. }
8. void captureEvent(Capture myCapture) {
9. myCapture.read();
10. }
11. void draw() {
12. image(myCapture, 0, 0);
13. }
14. void keyPressed(){
15. if( key == ' ' ){
16. save();
17. }
18. }

http://processing.org/reference/libraries/video/Capture.html
http://processing.org/reference/keyPressed_.html
http://processing.org/reference/save_.html