Add Logo to loop
Fairly easy if the logo is an image file that EW supports and the looping background is a video in a format that EW supports.
- Create a new blank Presentation.
- Add the Logo as an image to the slide.
- Now set the looping video as the background via Inspector.
- Adjust the size and position of the Logo image to suit.
What Don says above. You can also create a theme under the Themes tab and place your logo on the slide of the theme. Any time you use that theme, your logo will be displayed.