Control Computer with Hand Gesture Using Arduino and Ultrasonic Sensor

Hi, I'd like to ask for your assistance please. Is that possible to use arduino and ultrasonic sensor to control your computer with hand gesture? If so, can you enlighten me up please.

Thanks much.

Is that possible to use arduino and ultrasonic sensor to control your computer with hand gesture?

One ultrasonic sensor? No.

More than one? Maybe. For certain gestures. Not easy, though.