iMovie for macOS - Blur a Video (Gaussian Blur)
In iMovie for macOS, how do I blur a video (something like a "Gaussian Blur"-effect)?
I have an actor in front of a green screen keyed out, and a moving beach background video recording as a background. I want to blur the beach background video to simulate a constant out-of-focus (shallow depth of field) effect on the beach background, while keeping the actor in focus. How do I do this in iMovie version 10.3.9?
MacBook Pro 16″, macOS 13.5