I have noticed on occasions departing from NCL on the runway directly behind the gate area it can be quite tight for the crew to complete all duties. On one occasion last week the safety video was still playing as we entered the hold point just next to the runway. Do the crew need to inform the captain that the briefing is complete or would they just commence take off roll regardless - that's the closest I've known it come and it appeared we were holding until the video was complete as we entered the runway as soon as the video finished.