proper term would be videos, but they're the same thing. Aywho, I saw people posting youtube links to videos they had made on Game Booster's Facebook page. The rules of the contest said that using the Game Booster program itself to make videos was required.
With Sins game length, I wouldn't be suprised if you could call them movies.
Edit: v3.5.0 Beta
"Added video recording function when playing 3D games"
Now, is Sins considered a 3D game?