OSCemote is a remote control application for the iPhone and iPod Touch. It lets you send Open Sound Control messages to other programs like Max/MSP, Puredata, Eyesweb, Processing, etc.
Capture via a camera device which is sent to EyesWeb. This then extrapolates co-ordinates from the video feed and sends them via OSC (Open Sound Control) to another PC operating Processing. Processing decodes the string