At first glance, it really looks like we've stumbled upon some poor dude's last day.
According to multiple commenters on Reddit, however, there's a good chance this may actually be some really high-quality CGI. They based this assumption based on the way the snow from their feet appears to be getting kicked up (apparently in a weird direction), the lack of propellor noise, and the fact that the pilot doesn't seem to be overly concerned about witnessing a dude facing a potentially grisly death.
All that said, we currently don't really have any proof one particular way or the other about whether or not this footage was computer-generated or if it was real. It could also be real footage with a fake scenario (trained bear, possibly) since the internet has no real shortage of people finding new and inventive ways to acquire that feeling sense of validation from complete strangers.