Not entirely Glitch free but the best you can do entirely within QLab is copy the cue and offset by the banner width, then fade a group containing the 3 video cues followed by snapping back to the original geometry and restarting.
Better to prerender (In After Effects it's a distortion effect called offset, but you can also just animate 2 images) and then loop the video in QLab which will be smoother.