What does a research video look like?
Take a look at the MAD prize winning entries from last year and also check out other examples on the web:
What if I don't know much (or anything) about making a video?
The Jones Media Center can help! They have a lot of information and resources, including recording space and loaner equipment. They are also offering workshops and are available to answer your questions. There are no restrictions about how you make your video – you can talk to the camera, use props, incorporate animations, whatever you want to convey your research (and maybe the story behind it and why you did it).
Important tip: don't talk too fast! If your video is too long, think about what elements you can cut out. Don't just speed up the audio to make it fit in 3 minutes.
More information on the Jones Media Center MAD Research Video Competition webpage: https://www.dartmouth.edu/~library/mediactr/MADResearch.html