1. A method performed using a system, comprising: receiving an image, wherein the image includes an image of one or more body parts corresponding to a human target; comparing the image of the one or more body parts with a pattern of at least part of a human to determine that the one or more body parts corresponds to the pattern, the pattern being separate from the image; generating a model of the one or more body parts based at least on determining that the image of the one or more body parts corresponds to the pattern; tracking one or more changes of the model; and controlling a program executing on the system using at least the tracked one or more changes to the model.