If the Panopto video is embedded in a page or tool, first expand the embedded video via the “Watch in Panopto” arrow option in the lower right corner:

When the full-screen Panopto player expands, you will be able to trace the video’s location via the folders noted at the top of the player:

 

Please note that this method will only work for videos that you own in Panopto or for D2L and Panopto administrators.