How to make a curved background image?

I’m working on a high-rise archviz project and would like to show the skyline surrounding the building. The best example of this I’ve seen is in this video If there are downloads of generic city skylines that would be a great place to start as a proof of concept. If anyone knows how to actually make one that would be amazing. I have access to the building and can take panoramas but I don’t know how to get from panorama to whats in the video. I don’t believe this is a skybox but correct me if I’m wrong. I’ve been working with UE for only a week so the more basic explanation the better. Thank you!