It takes just a few minutes and if someone isn't watching, I politely ask them to put down their book/newspaper/etc... Your book isn't going to help you in an emergency, but knowing where your nearest exit is and that you have to PULL the oxygen mask to start the oxygen flow, could all be of great use to you.
As for the videos, I much prefer the live demo. People are more inclined to take notice if it's happening in the aisle infront of them.