Makes the interaction circle less boring.
(if you don't see any animation go to options -> mod options -> Animated Interaction Circle Options, and select the animation)
If you want to make your own animations you need to convert the source video to a .movie file which is just a renamed .bik file. You need RAD Video Tools. FYI: .gif files does not seem to convert too great so you need to turn it into a .mp4 file. If you want your video to have transparency then have a black background and change the blend mode from normal to add in settings. From testing your file should be scaled to 128x128 so that you don't get video artifacts.
You can use the example mod as a guide to make your own animations.
You need to follow the same file structure as the example mod. Replace the video file with your own, Rename the .xml, localization, and mod.lua to reference your video file. The video file can be any name you just have to edit the files to reflect that.