Additionally the images are not very compressed (edit: you mentioned that in your comment, sorry). While the RAW files can be a couple dozen megabytes and the losslessly compressed PNGs are still 5-15 mb, good cameras normally set the JPEG quality factor to a high amount and so even with a JPEG you're getting pretty close to a lossless image. Whereas in video you can often plainly notice the compression artifacts & softness. A more fair comparison would be the video file to a JPEG with equivalent visual quality.

see more details, https://sidbala.com/h-264-is-magic/

I know that's not fair comparison, but imaging clever compressions were not invented and you would download terabytes of data to view a small movie.

What question are you trying to answer? Nobody asked what is compression and why do we use it. I have been encoding videos since VideoCDs were a thing, so I have a pretty good understanding of how compression works. The fact that I differentiated between spatial and temporal compression should have been a clue. All I was pointing out was that compressing a postage stamp sized video and comparing its filesize to a large megapixel image isn't a fair comparison. (yes, I'm jaded by calling 1080p frame size a postage stamp. I work in 4K and 8K resolutions all day.)