Hi,
PTZ cameras are one device option to look at. I am thinking perhaps the proliferation of gimbals is another - somewhat related device - that can be considered for Izzy plugin development. I have a DJI Ronin M and a Ronin S gimbal and just a quick comparison of cost suggest these possibly provide good value and flexibility compared to the PTZ camera lineup - admittedly they are a BYO camera option. The PTZ cameras appears to have some shared protocol, but the diversity of gimbal makes and models are likely all proprietary. Still I would definitely use an Isadora Plugin that implemented gimbal control as an alternative to acquiring a PTZ camera. Specifically because the gimbal allows any number of camera types to be mounted and offer comparable functionality to PTZ.
Just a thought.
Best wishes
Russell