There is currently no GPS metadata support for videos in jAlbum, if you have tagged videos the only option is to add a link to the comments or elsewhere. The attached tool will create a Google Maps URL link using ffmpeg to get the GPS metadata in a video.
To use the tool:
In jAlbum's explore mode select the video you want to get the GPS data from.
Run the tool.
The clipboard will now have the URL ready for pasting into your comments field.
Tested on a Mac.
This was made purely as an exercise for myself, not really sure anyone would want to use it for real.