The Myo Armband should not need any introduction. Many folks have used it to work on fascinating gesture-based solutions. The below video shows how one can use a Myo Armband as a photography tool. The developer has modified a motorized tripod with a custom circuit board to control it with a Myo armband.
Kurt Schwarz‘s solution lets him move the camera left, right, up, and down with waving gestures while the fist controls the shutter. Think about all the possibilities here.