The Linguists (2008)
The Linguists is an independent 2008 American documentary film produced by Ironbound Films about language extinction and language documentation. It follows two linguists, Greg Anderson of the Living Tongues Institute for Endangered Languages and David Harrison of Swarthmore College, as they travel around the world to collect recordings of some of the last speakers of several moribund (dying) languages: Chulym in Siberia; Chemehuevi in Arizona, U.S.; Sora in Orissa, India; and Kallawaya in Bolivia.
More at Wikipedia.