creating a lightbox

[4evermaat]

I want to create a lightbox effect. You have a picture or video (usually thumbnail or reduced size of full picture), and then when user mouseOver or clicks on the thumbnail image, a 'lightbox' opens up with the full image/video/etc. And even a caption or additional textoverlay maight be possible in the lightbox.

How do I implement lightboxes with gravstrap? You have a modal shortcode, but I'm not sure if this can be used for images and video. grav has a separate featherlight plugin; but didn't know if that would interfere with gravstrap.