After months of spending 4 hours/day commuting instead of working on the tracking camera, a commercial solution from Hong Kong hit stores for $719.

https://www.amazon.com/dp/B07RY5KDX2/

The example videos show it doing a good job.  Instead of a spherical camera or wide angle lens, it manages to track only by what's in its narrow field of view.  This requires it to move very fast, resulting in jerky panning.  

It isolates the subject from a background of other humans, recognizes paw gestures, & smartly tracks whatever part of the body is in view without getting thrown off.   In the demos, it locks onto the subject with only a single frame of video rather than a thorough training set.  It recognizes as little as an arm showing from behind an obstacle.  Based on the multicolored clothing, they're running several simultaneous algorithms: a face tracker, a color tracker, & a pose tracker.  The junk laptop would have a hard time just doing pose tracking.

The image sensor is an awful Chinese one.  It would never do in a dim hotel room.  Chinese manufacturers are not allowed to use any imported parts.  The neural network processor is not an NVidia but an indigenously produced HiSilicon Hi3559A.  China's government is focused on having no debt, but how's that working in a world where credit is viewed as an investment in the future?  They can't borrow money to import a decent Sony sensor, so the world has to wait for China's own sensor to match Sony.

It's strange that tracking cameras have been on quad copters for years, now are slowly emerging on ground cameras, but have never been used in any kind of production & never replicated by any open source efforts.  There has also never been any tracking for higher end DSLR cameras.  It's only been offered on consumer platforms.