Hey hey :) You just need to create a post with a video and then post is a comment here. This way, everyone who is interested in the contest will see it and will be able to upvote it, even if they do not follow you. The winner will not be based on the amount of the upvotes, but rather the number of people who voted. So even if you get 10 votes from minnows and someone gets 4 votes from whales, you will still win!
Even more, these contest help minnows to attract more attention and followers! So go for it!