The new Skin lightGallery allows you to create a video gallery from YouTube, but to manage the titles and descriptions for videos (and improve the display of the thumbnail images) you need to activate for free your YouTube API key.
Go to the page https://console.developers.google.com making sure you are properly logged into your Google account.

Select a project or create a new one.
From the left menu click on "API Manager", then YouTube Data API and make sure it is active.
Again from the left menu click on "Credentials" and "Create credentials" --> API key --> Browser key
Enter the name and address of the site where you want to publish the video gallery. Enter the address in this way *.sitename.xx/*
It's also possible to indicate more than one address to use the same API key on more sites.
Copy the code of your API key and insert it in the appropriate parameter of the menu item lightGallery.