For people like me wondering what a "boid" is:
The name "boid" corresponds to a shortened version of "bird-oid object", which refers to a bird-like object.
https://en.m.wikipedia.org/wiki/Boids
I suppose you could also imagine it as a way to say "bird" with an accent?
Now onto the video.
The site linked in the video description is worth taking a look at for the rules of Boids by its original creator, Craig Reynolds, as well as for if you want more Boids or flocking in general.