1. A system comprising: one or more processors; and one or more computer-readable media storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform acts comprising: analyzing a sequence of motions represented by images, the analyzing based at least in part on Gaussian distribution of positional coordinates associated with the sequence of motions; determining one or more training sequences based at least in part on the sequence of motions; determining one or more reference gestures based at least in part on the one or more training sequences; determining, from an observed gesture made by a hand of a user, a first angular orientation of the hand associated with a first pose of the hand; determining a second angular orientation of the hand associated with a second pose of the hand; based at least in part on the first angular orientation of the first pose and the second angular orientation of the second pose of the hand, determining motion parameters of the observed gesture, wherein the motion parameters apply to a dynamic motion model; analyzing the motion parameters based at least in part on the one or more reference gestures; and classifying the observed gesture as one of the one or more reference gestures.