VIdeo Lightbox in Portfolio thumbnails (feature image)

Hi there,
https://karasudesigns.com/wp/3S2/

I would like to have video lightbox (vimeo or local video) effect instead of the current image lightbox when you click on the Portfolio Thumbnails Items (ie the Feature image on Portfolio post).

I’ve looked up your forum:

Is there a pop-up lightbox in the theme to open video popups?

Not sure how to implement that to replace the Feature Image..
Please help?