Looks like a bunch of 250's riding in Arizona. A new-gen Red one has a crash right at the end of the video. The crash bike is the one directly in front of the camera bike in the last half of the video.
Link to original page on YouTube.
IMO the ending was telegraphed pretty clearly throughout the vid, he was riding way over his abilities. Not that he was going particularly fast, but his lines were terrible and he seemed to not be in control of steering the bike where he wanted it to go; limited knowledge/experience in countersteering, from what I can tell. The crash is right around the 7:50 minute mark, and you can see how he just doesn't turn into the left bend to follow the road, panics and runs off the road with the front brake on quite hard, and the bike immediately hits the ground. Thankfully it looks like he didn't have any life-threatening injuries, but may have banged up his leg pretty well, and damage to the bike is significant.