def cleanup_video(self):
        '''
        .. versionchanged:: 0.6.1
            Log terminated video source process ID.
        '''
        if self.video_source_process is not None:
            self.video_source_process.terminate()
            logger.info('Terminated video process: %s',
                        self.video_source_process.pid)
            self.video_source_process = None