Markerless tracking
From Virtual Reality, Augmented Reality Wiki

- See also: Markerless, inside-out Tracking and Positional tracking
Markerless tracking is a type of tracking that does not use fiducial markers. In an optical-based tracking system, certain identifiable features, such as the shape of your fingers, can be used for tracking. Leap Motion utilizes this system to track the position and movement of your fingers.