Start synchronized video encoding/recording of the cameras associated with the video group
#include <camera/camera_api.h>
camera_error_t camera_start_video_group(camera_video_group_id_t group_id)
This function simultaneously starts all video recording or encoding for cameras associated with the video group. Before you call this function, all cameras that are associated with the video group must have called camera_start_video() or camera_start_encode().
To stop video recording or encoding, call camera_stop_video_group().
CAMERA_EOK when the function successfully completes, otherwise another camera_error_t value that provides the reason that the call failed.