To zoom in to store images:
Click on the Pages tab and select the Store Page. Click on Edit. Select a product and then click on Edit. Scroll down to the More Images section and click on Upload. Choose the images you want to upload and click on OPEN. Hit SAVE. Now close the edit window and navigate on your store page. Select a product and click on the information icon. Move the pointer over the image and you will visualise the zoom in.
To zoom in to store images step by step: