82: Kevin MacDonald on Whitney Houston

Whitney Houston had an angelic voice, but fought demons in her personal life. The new documentary “Whitney” explores her talents and tribulations. Filmmaker Kevin MacDonald previously directed the documentaries “Marley,” “Touching the Void,” and the Oscar-winning “One Day in September,” as well as the fiction film “The Last King of Scotland." Pure Nonfiction host Thom Powers talks to MacDonald about creating a nuanced portrait of a complicated singer.