Cropped and slowed video. To me, looks like a damn silverback or some other great ape and we ain’t got them in North America https://imgur.com/a/Evr29Ao
In subreddit r/bigfoot
In a post titled:
The nature documentary Great North may have an unusual cameo in it. At four seconds into this clip a strange humanoid figure can be seen running alongside the Caribou. Due to the remote nature of the footage some have claimed that the crew accidentally captured a sasquatch.