On the T2i I use.
In the menu setting
1280x720 (50 or 60 fps) : all depend of the lights frequency.
Manual video exposure.
High light priority : off
Auto lightning correction : off.
On the camera setting.
Opening speed : everything above 200. Below your software slomo will be a little blurry.
Iso : never above 800.
Everything else will be in function of your needs of lightning, depth of field, artistic means...