You aren't required to show the judges your video, but if you decide to show them it will count as part of your 5 minutes of presentation time.
I believe you need to have a 5 mb version of it for the use of FIRST, but you can show whatever quality video you wish if you choose to do so during your presentation.
As for presentation questions, be prepared to go more in depth about elements of your presentation you may have only grazed the surface of if the judges want to know more about them. Reasons for why you are involved in FIRST are also good a good thing to keep in mind.
Best of luck.
