Ranbir Kapoor is all geared up and shooting for the biopic of Sanjay Dutt. Rajkumar Hirani seems to have gotten in sync to shoot at length for the film. What is really to be depicted in this much-awaited biopic was never clearly said. But now Ranbir has come out to talk about the biopic in which he is playing Sanju baba, which could just be the film he needs to get his zing back at the box office.