Spoiler below if you don’t want to hunt for it
That very video is located above, so you can hunt for it if you wish (or just grab the solution below). Here’s a tip: you can pause a YouTube video and press “,” or “.” (comma or period) to advance each frame. You can also opt for a slower playback setting by clicking the gear below the video. The code pops up very early on, so don’t hunt for the full minute and a half for it.
Ready? Here it is:
The code: MO-DH4G-J23P-MW4R
This is what you’ll get for your efforts! Pretty neat that it was there all along.