Magic Zoom should indeed work with HikaShop.
You need to install it following the directions on:
www.magictoolbox.com/magiczoom/modules/joomla/
Then, you can add in your products description (via the HTML mode of your wysiwyg editor) some code for the images like explained there
www.magictoolbox.com/magiczoom/integration/
on point 4:
<a href="big.jpg" class="MagicZoom"><img src="small.jpg"/></a>
You need to have your MagicZoom module published and displayed on the page in one of the positions of your template so that it works properly.