1. A method for tracking a user, comprising: receiving a first depth image, the first depth image being captured by a depth camera; based at least on identifying an estimated location of an extremity of a user in the first depth image, positioning a part of a model to correspond to the estimated location of the extremity in the first depth image; and based at least on determining that a location of an extremity has not been estimated, adjusting a part of the model that is located close to a portion of the depth image to correspond to the portion of the depth image.