What is the difference between Gatekeeper, Advanced Gatekeeper and Active Gatekeeper?
Extra functionality is available with each type of gatekeeper:
Guarding a gate and its surroundings.
Zooming in when an object appear.
Zooming out after a pre-set of seconds.
Same as Gatekeeper, but the gate does not have to be in the center of the field of view.
Same as Advanced Gatekeeper and adds possibility to use Autotracking to follow an object that moves away from the gate.