Thanks for that explanation.
So technically, adjusting the shutter speed through it's range would also alter the "smooth/roughness" of the video, regardless of the fps? Ideally would you set shutter speed to match fps or slightly faster?
The most typical setting is a 180 degree shutter angle. Which means that for each frame half the time the shutter is open, half the time it is closed. So @ 24fps each frame lasts 1/24 a second, so a 180 deg. shutter would imply a shutter speed of 1/48. You can go slightly slower if you want, but it won't be as "film like", plus the mkii can't go below 1/30 in video mode.
If you are using a 5D mkii, there is no setting for 1/48, so go with 1/50. Notice that if you want to control your depth of field, you are only left ISO as a degree of freedom unless you use something like a neutral density filter to control the amount of light coming in.