What it's like to turn the camera on Snowden and Assange

Who people tell you they are is often different from how they act, says award-winning filmmaker Laura Poitras, whose latest film, "Risk," looks at WikiLeaks and Julian Assange. By observing subjects like Edward Snowden make decisions in real time, she gets to experience the immediate drama of her story and change her opinion. Poitras gives her Brief but Spectacular take on making documentaries.