Recommendation

This kind of functionality would not need a plugin, just some basic CSS would get the job done.

Here’s a tutorial with some more information on adding hover effects via CSS (click any of the ‘try it yourself’ buttons to see the CSS code you would add to the ‘Additional CSS’ area of Customizer, and the class to add to your images):

https://www.w3schools.com/howto/howto_css_image_overlay.asp