A parody based on Nanook of the North (1922). "Nanook of the North" is considered the first "official" documentary; it was directed by Robert Flaherty in 1922.
The scene where Fred Armisen (Pipilok / Kunuk) is ranting is a near word for word reenactment of an infamous incident on the set of I Heart Huckabees (2004) where David O'Russell berates Lily Tomlin and destroys part of the set.