I figured this out. In events, you have to go under:
-System
-Every X Ticks
And then figure out how many ticks the video is. It will automatically loop at that point. I actually used "Every X Ticks" as my beginning event for this layout page in order to make this work. I'm not sure if this will cause any conflict down the road for this particular layout page, but for now it's working.
Perhaps this information was unknown, because when I searched there was another thread on this from last year that had no replies but hundreds of views. If so, this might be a starting point for information on how to loop video in Construct.