Inside the CIA's museum of spycraft

At the Central Intelligence Agency's headquarters in Langley, Virginia, a newly-redesigned museum – accessible only to authorized persons – chronicles the successes, failures and sacrifices of intelligence operatives through the years. CBS News' Norah O'Donnell gets a private tour with CIA director William Burns and finds out how compromising human intelligence sources can put American security, and the lives of CIA agents, at-risk.