How to achieve the effect shown on the landing page of this website? https://monopo.london/ [closed]

I'm wondering how to replicate this effect on https://monopo.london/ where the mouseover interacts with the colours.

Thought it would be something like this https://tympanus.net/Development/FlowmapDeformation/index.html but it does not seem like it as in this case, it's a still image. In Monopo London, the mouse was interacting with the colours.

Please advise! T.T