The video you provided the link for sure does show a lot more detail. The second guy out of the truck throws something into the snow. Logic suggests a gun. It also seemed like Finicum's hands are up and then he gets shot (instead of reaching for a gun). I know many said that already, based on the first short video. I didn't think it was 'clear' in the first video.
I think it is in the full one. The laser dots on his head seemed to be awfully steady , considering no one was that close to him. As if they were from a fixed position sniper and indicate the sniper was in an elevated position.