Oscar-winner Angelina Jolie steps behind the camera in “Unbroken.” For her second film as director, Jolie tells the true story of Louie Zamperini, the American Olympic runner who survived a plane crash, 47 days in shark-infested waters and a Japanese prison camp. With a story as incredible as Zamperini’s, it’s difficult not to captivate audiences — which Jolie does, briefly. The film begins with a close-up of Zamperini’s aircraft dodging missiles in a fiery sky. The year is 1943 …