If you are having problems using the webcam, or communicating Arduino and Processing, please check that:
Once the code is uploaded to the board, the IDE has to be closed.
In processing: run the program once, identify the camera in the output list (which are your computer’s ports) and change the
indexin the following code line for the number associated to the camera:
initializeCamera(index); myPort = new Serial(this, Serial.list()[index], 9600);