<a class="thumb-hover-link" rel="bookmark" title="Permalink to Wedding Couple " href="http://www.weddinglight.com/gallery/wedding-couple-paris/"></a>
If you can remove the
title="Permalink to Wedding Couple this will have the same effect as removing the popup on hover.
Finding the code to edit depends on your theme template files and how it pulls the featured images. Since you are using a pro theme from a dev at Themeforest your best bet is to contact the theme developer for assistance.