1. A processor-implemented method in a motion capture system, the method comprising: based on frames of image data of a field of view of a depth camera system, tracking a person's body in the field of view, the tracking provides results for use by an application in providing an avatar in a virtual space on a display, such that the avatar represents the person's body and is controlled by movement of the person's body, the tracking comprises detecting the person's body at a last detected location in the field of view before determining that the person's body is no longer detected in the field of view, the last detected location is in a central region of the field of view, relatively far from edges of the field of view; and imposing a wait time before the application concludes that the person no longer intends to interact with the application, where the wait time is a function of a distance of the last detected location from one of the edges of the field of view, and the wait time is longer when the distance is greater.