use wix code to show video on a gallery via mouseIn

Hi,
Any help at all would be hugely appreciated!
I have a pro gallery on my site and the content being displayed on the gallery (images) are being shown when I preview the site. When you click on the image the URL in the dataset is being loaded. I would like to show a video associated in the dataset when an item is being hovered over by a user. I cannot figure out how to reference an item in wix code and there is no option via the interface. Any suggestions most welcome