1. A method of calibrating a six-degrees-of-freedom (6DoF) pose of a natural user interface (NUI) camera relative to a display: receiving, from a calibration camera, calibration video imaging an environment from a calibration perspective that sites the display and one or more features; three-dimensionally modeling, from the calibration video, a three-dimensional map of the environment, the three-dimensional map of the environment defining a 6DoF pose of the display within the environment and a three-dimensional location of each of the one or more features within the environment; receiving, from the NUI camera, primary video imaging the environment from an operation perspective that sites the one or more features; and finding a 6DoF pose of the NUI camera within the three-dimensional map of the environment based on the operation perspective view of the one or more features.