1. A method, comprising: receiving one or more depth images from a depth camera, the depth images indicating a depth of a surface imaged by each pixel of the depth images; identifying a human subject imaged by the depth images; recognizing within one or more of the depth images a beacon emitted from a control device; assessing a position of the control device in three dimensions; and associating the control device with the human subject based on a proximity of the control device to the human subject.