Is there a screen saver or video for the video wall 8K wide and 1K high?

Question

YouTube

Good day everyone.
Can be who faced similar?
We have: a video wall of 4 TVs in a row connected to a PC. In total, 8K pixels in width, 1K pixels in height.
Task: run a video series on these 4 screens, which will be displayed on all screens simultaneously as one whole. The essence of the video is the underwater world.
Problem: 8K video will be heavily cropped horizontally because Most of the video aspect ratio is 16:9. Yes, and in 8K there are still few videos on the Internet.
Questions (possible solutions):

• Maybe there are screensavers (softins) that can be adjusted to any resolution? Googled and found nothing of the sort.
  
• Alternatively, maybe there are some scenes in ala 3dsmax that can be rendered at any resolution? Maybe, of course, this is from the realm of fantasy)
  
• Or, at the very least, maybe there is a catalog with high-quality 8K videos (sorry, there are not many of them on youtube yet)? Googled only with 4k (uscenes dot com)
  

Thanks for the suggestions!