The Kinect sensor tracks the movements of a person in the arena, monitoring his arms and shoulders. As he raises his arm, the quadrocopter takes off; he can control it by sweeping his right arm around.
A raised left arm tells the quadrocopter to flip; a clap of the hands tells it to land. If the user drops both arms, the quadrocopter will hover. The user is protected by a no-fly zone around him, so the quadrocopter can’t fly into him. A standard controller gives the copter directions, as the video explains.