It´s fairly simple to achieve this type of zoom effect in Webflow using zoom.js
I made a quick test here: http://playground-pk.webflow.io/fatzoom-js
1 Get the files here:GitHub - fat/zoom.js: Medium's Image Zoom for jQuery
2 Add these references before tags in custom code
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3 Add data-action=“zoom” to the custom attribute of the image
_Actually i found out that you can add the data-action to a higher level element such as rich text block and then all the images you add inside will zoom. Useful if you have a collection and don´t have the possibility to add a data-action directly to the element in Webflow.