Add and edit backgrounds in iMovie on iPhone

You can add a color background to your video. iMovie includes a number of solid, gradient and pattern backgrounds that you can customise.

Add a background

With your project open, scroll the timeline so that the playhead (the white vertical line) appears where you want to add a background.
Tap the Add Media button , then tap Backgrounds.
Tap a solid colour, gradient or pattern, then tap the Add to Project button .