Assuming you are applying jquery on selector class for image , if you
can apply of static image, similarly you can apply on image from db.
<%= image_tag "add_zoom.jpeg" , class: "zoom" %>
or
<%=image_tag product.image , class: "zoom" %>
these are certain plugins you can use for zoom:
http://www.elevateweb.co.uk/image-zoom/examples
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