Almost 40 years after the communist Khmer Rouge took over Cambodia and embarked on a four-year reign of terror and genocide, many of those who survived are finally able to talk about it. That includes a film director whose documentary about the Khmer Rouge received an Oscar nomination - the first for a Cambodian film. Some survivors living in the United States say the film brought back painful memories but helps in the healing process. Elizabeth Lee reports from Long Beach, California, home to the largest Cambodian community outside Cambodia.