Ok, I'm not some anti hunting activist. Hell I own a hunting license. As long as the hunting is legal I have no problem with it. That guy probably makes videos because of the obscene amounts of money needed to pay for Big Game licenses in Tanzania.
Also keep in mind that in many game preserves BECAUSE of all the work done to protect these animals, a certain overpopulation is not unheard of. I know that in Krueger Park they had to take down some Elephants because they were killing other animals and basically causing havoc, while the rest of the animal population was well up to what it should be. And I don't really think this dude could sell videos of it if he was Poaching these animals. Most likely completely legal.
However, the video showed multiple people firing at the animals. They were also using what looked to be 50 caliber elephant guns. Not very sporting if you ask me. Seems more primal to me. The videos still made me nautious and it wasn't the blood or death. Would have been nice to know the video was made over the course of a year or two. But we don't know that.