1. A method for enabling a user to make hybrid-gesture input to an application, comprising receiving first data representing movement or position of the user captured by a capture device; receiving additional data concerning movement or position of a second user, different from the user, captured by the capture device, the additional data not being derived from the movement or position of the user captured by the capture device; combining the first data with the additional data to form a combined gesture including combined movements or positions of a combined center of mass of the user and the second user, but not determining that the first data alone or the additional data alone indicates a likelihood that particular system-recognized input was performed by the user; and based at least on determining that the combined gesture corresponds to a particular system-recognized input, sending an output to the application representative of the particular system-recognized input, wherein the system-recognized input is the combined center of mass of the user and the second user and the system-recognized input is varied by varying the combined center of mass of the user and the second user.