Rotomation is a technique of animating a 3D element on top of the tracked motion picture footage, frame by frame to match an actor or an object in a live-action plate. It goes hand in hand with matchmove.
Keying is a family of modulation forms where the modulating signal takes one of a specific (predetermined) number of values at all times. The goal of keying is to transmit a digital signal over an analog channel. The name derives from the Morse code key used for telegraph signaling.
A tracking shot is any shot that physically moves the camera through the scene for an extended amount of time. Tracking shots often follow a traveling subject, though they can be used to simply show off the scene
Matchmove artists match computer-generated (CG) scenes with shots from live-action footage so the two can be convincingly combined. They recreate live-action backgrounds (plates) on a computer in a way that mirrors the camera on the set in every way, including lens distortion.
Matchmoving also uses camera tracking. Wherein insertion of computer graphics in a live action footage happens. Matchmoving is an application of camera tracking, because you are trying to match the movement of the virtual camera.
