Deck Background Video

Here are the steps to upload the video:

Step 1: Click on 'Edit Background'

Step 2: Click on 'Image Picker' at the top right of the background editor

Step 3: Click on 'Video Background' at the top right of the pop-up screen.

- preferably a looping video of less than 10 seconds

Here's a video tutorial on how make background videos with perfect loops in PowerPoint:

Here is an example deck that has a wonderful video background:

https://deck.toys/a/7yC69Od7c