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from : https://www.tiktok.com/@jlmelenchon/video/7053478405584489734?is_copy_url=1&is_from_webapp=v1&q=m%C3...
You could play with masking the mosaic effect.
It looks more complicated than just using the mosaic effect and adding a mask. There are some inconsistencies which I'm not able to reproduce
check thios out: https://www.youtube.com/watch?v=dcbc-j8yYX0