The TriBeCa Film Festival kicks off its 12th year in New York with the rock-documentary 'Mistaken For Strangers.' This year's festival will feature more documentaries than in the past, including non-fiction films about Richard Pryor and Elaine Stritch, and 'Lil Bub and Friendz' which follows the internet fascination with all things feline. Kristina Behr has the details.