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Add a movie to your project in GarageBand on Mac
You can view a movie file in your project while you create the soundtrack in GarageBand. Although you can’t edit the video directly, you can add to or replace the sound from the movie file with music, sound effects, and dialogue in your project.
A project can contain only one movie file. You can open the movie in a floating Movie window, and also display the movie frames in the Movie track. When you play the project, the movie also plays, following the playhead position.

You can resize the Movie window freely by dragging one of its corners.
Note: If the movie is in an unsupported format, an alert appears. You can convert the movie to another format, then try opening it again.