5 years after lions got serious about this project, OBSBOT is knocking it out of the park, in a sense.  They're all still based on face tracking.  The best ones still are required by law to use indigenous Chinese cameras with horrendous light sensitivity.  They would still have a hard time with 2 animals with obstructed faces in unusual positions.  Their face trackers are hitting high frame rates, allowing fast movement to be tracked.

The lion kingdom still hasn't had enough money or time to use the tracker for its intended purpose, since building the jetson nano system.

The other project requires tracking 1 animal in a crowd while being mounted on a small vehicle.  The obsbot would be no use there.