How to make a vertical looped scrolling background with perspective? (Example shown)

The aim described in the question title might not be easy to picture, but I'm asking about something like in this Humble Bundle website:

I'm not a pro coder, so I can imagine maybe something like a continuous vertical slideshow transformed with some perspective effect. Maybe somebody has a simple solution?

Oh, and I saw somewhat of a similar example with people making a "Star Wars opening text crawl", eg.:

I could swap the text with images, but it's still not so close to the Humble Bundle page effect.

Thanks for checking out my question! Cheers!