In the months since the Los Angeles Police Department began rolling out thousands of body cameras to officers, during a time when video has prompted new scrutiny of policing across the country, a key question persists. When should the footage become public? On Tuesday, the civilian board that oversees the LAPD began a process to review the department’s current policy of generally withholding that video —whether it was captured by body cameras, patrol car cameras or otherwise collected during an investigation— unless ordered to release it in court. Some police commissioners, along with Chief Charlie Beck, have indicated in recent months that they were open to revisiting the policy, but Tuesday marked a more formal step toward that.