Re. Nanook of the North, it is indeed a moving, and fascinating film. Just be aware that many elements of the film are much more staged than we might consider appropriate for a documentary made today. For a start, Nanook's real name was actually Allakariallak, and the two women described as his wives in the movie were actually not his real wives, but common law wives/mistresses of the filmmaker, Robert J. Flaherty, whom he cast into the roles. More generally, Flaherty encouraged Nanook/Allakariallak to demonstrate authentic but old-fashioned even for the time elements of his culture for filming purposes, such as hunting with a spear/harpoon even though he normally used a gun.