What is this film technique called?

I saw an Instagram post that stopped me in my tracks the other day. It was a person in frame completely still with the environment moving around them.

I'd love to try this on my own page but I don't know what it's called or how to look it up. Anyone have any insight? Here's a link to what i'm talking about:

https://www.instagram.com/p/DRp7EHdiZkS/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==