In 1971, when sound designer Jim LeBrecht was 15, he had a summer of love  at a camp for disabled kids. It was a place that fostered a spirit of history-changing activism. He and his friend, filmmaker Nicole Newnham, agreed that this was a movie. They didn’t anticipate that Barack and Michelle Obama would think so too. Newnham and LeBrecht tell us about their Netflix documentary “Crip Camp,” and partnering with the Obamas’ production company.