Circle of the Sun
Circle of the Sun is a 1960 short documentary film on Kainai Nation, or Blood Tribe, of Southern Alberta, which captured their Sun Dance ritual on film for the first time. Tribal leaders, who worried the traditional ceremony might be dying out, had permitted filming as a visual record.
On National Aboriginal Day in 2011, the NFB released the Pete Standing Alone trilogy, which includes Circle of the Sun, Standing Alone and a 2010 film, Round Up. The trilogy documents 50 years in the life of the Kainai Nation, as well as Standing Alones personal development from a youth to a tribal elder.
Source: Wikipedia