You can select what will be displayed in the background of movies.
In Background type section, choose between image, color or having background the same as in Images tab.
If you select Use Image option, you will be able to click Select image to choose background image from your hard drive, or use the same image as in the Images tab.
Or, if you select Use Color option, you will be able to click Select color to choose background color or pattern. See Background Color section.
Using Same as for Images option, background will be the same as Background of Images.