I don't know of any "Companies" that do this. You might check with your local Security Camera Installers though. Todays Security Camera are very high quality (read: Expensive) and have the ability tolt, pan and zoom. Most of what you see on the local TV station, is usually an older camera that was going out to farm or a small handycam mounted to a panning plate and controlled with one of the old TV antenna rotaters. Getting a Plexi housing for it could be a challenge, but certainly they are available.
Hard wire everything and weatherproof it and your in business. On a system like that, you could easily get away with about $500 or less cash outlay and DIY.
As far as the Security Cameras go, We've got some here at work that have excellent zoom capability and are mounted in weatherproof housings with a 360 degree pan and a 180 degree tilt. I don't know what the cost is, but I would guess between $3K and $4K per camera not including the controller.