I would expect him to pay attention. Partly as CIHY says, to set an example. But also because he needs to also be in the mindset of "passenger" in an emergency (unless asked by the crew to take a role in the proceedings). Watching the video would remind him of this.
No different from the rest of us, who get reminded each flight of the seat belt mechanism, in the hope that in emergency we don't panic and think it works like a car seat belt.