Hello my name is Rich,
I hope I understand your question.
It is possible to put a vertical image or even a video banner on the sides. I’ve done it. Bit tricky making the video, but I digress.
Think of your image as the full height of the page. Add an image, or video and reduce it small enough to fall within the vertical section. To fill the section click the ‘expand to fill’ bread crumb in the upper right of your image. It will fill the section.
The trick is to make your image or video vertically. I have done a video, and there are some image quality issues I’ve had, but I believe that may have to do with how I format it during export. Otherwise its bloody awesome! The trick is, you must consider the total pixel height of your page, so you need to build in some tolerance for the image or video to expand and contract.
Hope that helps