An iSight app waiting to be written

I want one of these:

What the world desperately needs is an app to track someone moving across the field of view of the iSight camera, lock the missile on target, and fire on voice command. Maybe with a “danger, danger Will Robinson” thrown in for good measure.

YouTube video

Imagine how brief your interruptions will be when your cubicle visitors see the missile launcher swivel in their direction before they even sit down.

Thanks to TamsPalm for finding this.