Automatically? Without an operator?
I am not sure any PTZ would work well in that scenario as there are too many potential objects to track. People would probably be confused when the PTZ regularly looked the 'wrong' way.
IPVMU Certified | 12/11/15 07:10am
If money is not too big a concern you might consider the new Axis PTZ panoramic.
I used to have an Axis 233D that I would use to auto track bands playing live at bars. It kinda worked. It did ok with the pan and tilt but if it was set to auto zoom as well, it loses too much of the FOV and can't detect much of anything at that point.
I don't know if the new Axis can use the panoramic FOV for the trigger, but if it did that would work better. Also you could also show bot the overview and the PTZ split screen or carousel.
Another trick I used was by having it default to a guard tour when there was no motion, that way it would unstick itself and try to find the action again if it got stuck looking at nothing.
http://www.movensee.com and now get the ball to box with the electronic module attached.