What's the best webcam for Mac with tilt/pan/zoom?

I am trying to find a good quality webcam to use for videoconferencing with my Mac (MacBook Air actually). The camera is to be positioned on the 60-inch screen on the wall in our boardroom so the built-in Facetime camera doesn't do the job. It needs to have tilt/pan/zoom (in software). When I started on this search I had no idea such a thing was going to be so hard to find. There is no shortage of such products for Windows but I can't find a single one for the Mac.

There are a lot of webcams that claim to support Mac but on closer investigation not a single one of them (that I've found so far anyhow) provides any conrol features like tilt/pan/zoom - nor even brightness and contrast control for that matter. Maybe I'm looking in the wrong places because it's hard to believe the Mac world really is lacking such products. Can anyone point me in the right direction? Would be much appreciated.