Hover between two featured images

Good afternoon authors.
it is possible to achieve an effect of hover between the two featured image? If so, in what way? I use twentytwelve and I imported in the file funcion.php of my child theme, a few lines of code made ??by Codex to link the featured image at its permalink.

I’ll waiting for your answer.
Thanks ??

https://www.ads-software.com/extend/plugins/multiple-post-thumbnails/