Add zoom out/in effect on image banner when scrolling up and down

Hello! Hope you are doing well.

Could you please explain me how to add a zoom out/in effect of the image banner when scrolling up and down and at this time picture is slightly moving out and in? Like on the Ella theme - Home 21 - Yoga?

Here you can see what I mean - https://new-ella-demo-11.myshopify.com/

Choose demo and then - Home 21 - Yoga

Thank You very much!

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