Create video inlay boxes or borders for video making in Apple Keynote

How to put a video in a box or border using Keynote that can be saved as a video. Great for creating an online course or in-person teachers to hold attention... plus it is free software not $250 like Camtasia that does this function. This can be done split-screen with the same technique. To save- Record and let play length needed then close out and save, Export- save as video. Upload that video anywhere or take it to iMovie or another video editing software. I use this video style on Udemy. It is more interesting than a plain video teaching segment made on my iMovie or Movavi. Free video editing software for Mas users. Windows users can use Apple Keynote on the iCloud (need great wifi). Always record as video not live on iCloud due to risk of poor internet.