I’m sorry but this particular request is beyond the scope of support and is not a theme related issue. Please visit Envato Studio or Werkpress for further customization. You can try to implement the enfold’s avia_hover_effect on js > avia.js file to abundance then get the image-overlay css on layout.css. Aside from that, we won’t be able to help you further. You may need to investigate this particular feature on your own or hire someone to implement it for you.
If you have any further questions about the theme, we are more than happy to provide you with assistance on these inquiries. Thank you for your understanding.