There are two ways to save video pins on Pinterest. Option 1: while touching and holding the screen of the video pin that you want to save, when a pop-up saving option appears, you just need to click on it. Option 2: Open the video post on your screen>tap on it>hit on the red "save" button. On your desktop, open the post of your selected video pin & go on the red "Save" option given on the top-right side of the screen.