Pretty saturated market. I have a very close friend who works for a major TV show/magazine. He shot a caribou, two black bears, and two mulies on camera for their show in the last year. Takes a lot of start up to get going, and not to be rude or anything, but with the number of people already filming hunts, who own major properties, etc, sponsors don't have to pay big bucks to sponsor people. Most likely, sponsors will give you products that by contract you have to use while filming....
Like someone else said, selling hunts and guiding is where the money is at. Just look on youtube, every Tom dick and Joe thinks they have their own television show....
Reality is, it's gonna be hard to get into this market.