Wonderful work from ETH Zurich with their Vicon motion capture system and a Ascending Tech quad:
"[T]hey are using Kinect to monitor their joint positions, mapping a handful of actions to the operator’s movements. Once the quadrotor is aloft, it can be directed around the room using the operator’s right hand. The gesture recognition system responds almost instantly, guiding the vehicle in all directions with ease. When the user’s left hand is raised, the quadrotor does a mid-air flip and awaits its next command, while a quick clap of the hands brings the machine to rest on the ground.
For the protection of anyone testing out the system, overhead motion tracking cameras are used to keep track of the Kinect’s position, creating an invisible midair barrier through which the quadrotor is not allowed to pass."