Because of the number of teams, your video is key to this event to get to the final demo day pitches.
Your video should demonstrate the following:
This is a public record of you and your contributions and ideas that will live on beyond the event.
Make it count.
All team members should have a portfolio since they will be added to the project page.
Fill out bio, social media links, skill sets.
Import Project From GitHub
Create Project From Scratch
or
You will be asked to fill out a number of fields relating to your project, make sure to:
Finalize and submit the project.
Celebrate.
Continue working on project.
Make time to record your video. It matters.
Make sure to look at judging criteria and craft your message around what judges are looking for.
Make some noise. Share on social media. Get likes. Contribute feedback to others submissions, they might pay it back or share with someone else.
Look at other video submissions from other hackathons for inspiration.
Make sure to consider the business viability of the application. How would this get implemented?