Animating materials for 2D facial features?

I found video [2D Eyes Maya to UE4 - YouTube] which shows pretty much what I’m trying to go for, but unfortunately the video doesn’t show the process of how its done. As for Flipbook, I guess I could the animate the eyes that way, its just I would probably have to make a ton of frames in order to avoid having the eyes move in a very choppy manner. I did come across video for how to animate textures with Flipbook [Unreal Engine 4 Tutorial: Animated Materials / Flipbook - YouTube]](Unreal Engine 4 Tutorial: Animated Materials / Flipbook - YouTube) but I would rather use the Flipbook method as a last resort & go with a method of being able to shift the pupil texture around the surface of the eye area. I still need to use Flipbook for a myriad of other things though, like adding blinking to my character or rotating spiral eyes for a character who is stunned.

**EDIT: **I also found video [UE4: 2D eye rotator - YouTube]. Is what I’m looking for or would it not work for my purposes?