1. A computer-implemented method of identifying a user of a computing device, comprising: capturing image information using at least one image capture element of the computing device; analyzing, by the computing device, the image information to identify a position of at least one feature of a person near the computing device; tracking a position of the at least one feature over a period of time in the captured image information; determining, by the computing device, a set of points including both position and time information for the feature during at least a portion of the period of time; comparing the set of points to at least one gesture pattern stored for an authorized user of the computing device, the gesture pattern including both a path of movement for the gesture and at least one of relative timing, acceleration, or velocity information for a plurality of points along the path of movement; and providing input indicating that the person is an authorized user of the computing device when the set of points matches one of the at least one gesture pattern stored for the authorized user with at least a minimum level of certainty, wherein a user is able to be identified to the computing device based at least in part upon a combination of a specific gesture and a way in which the user performs that specific gesture.