[Plugin: NextGEN Gallery] Description Overlay for basic slideshow

I am trying to do something which should be simple, but I cannot figure it out & am looking for tutorials.

I would like to get the image description to appear as a text overlay for its image in the basic slideshow (the one that uses the slideshow shortcode). Is there a tag I can add to the shortcode to do that? Or can I make / download a custom template that will do that for me?

Any guidance / points to tutorials would be appreciated. I have googled this to death and can’t find anything anywhere.

Thanks.