There are number of playlists these days on YouTube that comes with interstitials in between videos, either short intro or outro videos which recap the whole previous video and introduce the next one. In order to make things easier for you to tell great stories through playlists, YouTube has added interstitials right in the playlist editor.
Here’s what YouTube Engineer Eric Lundberg had to say about it:
You can choose from a variety of styles for text introductions and even add royalty-free music tracks. Interstitials will appear as unlisted videos in your account, and are eligible for monetization if they are at least 15 seconds long.
To do so, create a playlist or go to edit an existing playlist, then click + Introduction:
A window will pop up prompting you to record a video with your webcam:
If you prefer, you can create a text-only video instead: