A new documentary on Roman Polanski is being shopped for US distribution by Jeff Berg, the über-agent who’s just stepped down as chairman of ICM. Andrew Braunsberg — producer of the Peter Sellers’ classic “Being There” — came up with the concept for “Roman Polanski: A Film Memoir” when the controversial director was under house arrest in Switzerland in 2010. “The idea came to me to do a conversation between two friends when [Roman] was in a really terrible situation and extremely low,” Braunsberg, Polanski’s friend for 50 years, told us. In the film, Polanski touches on his life including his experience as a Holocaust survivor, the murder of his wife Sharon Tate, the infamous case that prompted him to flee the US. Directed by Laurent Bouzereau, the doc has European distribution deals, and Berg’s still negotiating in the US, where Polanski’s a polarizing figure. “Memoir” made its US debut last week at the Bryant Park Hotel for a crowd that included Peggy Siegal, David Ives, former French Vogue editor Joan Juliet Buck and Alexander and Lisa Vreeland.