player background blur effect about cabbage HOT 2 OPEN

let timeline = Timeline()
...
let blurredFirstFrame: CIImage = ...
timeline.passingThroughVideoCompositionProvider = BackgroundComposition(backgroundImage: blurredFirstFrame)

import AVFoundation
import VFCabbage

final class BackgroundComposition: VideoCompositionProvider {

    let backgroundImage: CIImage

    init(backgroundImage: CIImage) {
        self.backgroundImage = backgroundImage
    }

    func applyEffect(
        to sourceImage: CIImage,
        at time: CMTime,
        renderSize: CGSize
    ) -> CIImage {
        sourceImage.composited(over: backgroundImage)
    }
}