Autoevolution: One of the big new features in the new 2016 BMW 7 Series cars is a gesture control. "The system uses a 3D sensor installed in the roof lining of the car, next to the rearview mirror. It recognizes the hand gestures of the driver, as long as he keeps his hand between the steering wheel, dash and the gearshift lever. The system works best if you use gestures close to the dash and in front of the iDrive screen."
BMW video tutorial shows its operation: