let videoEditor = YiVideoEditor(videoURL: videoURL)
videoEditor.rotate(rotateDegree: .rotateDegree90)
videoEditor.crop(cropFrame: CGRect(x: 10, y: 10, width: 300, height: 200))
videoEditor.addLayer(layer: layer)
videoEditor.addAudio(asset: audioAsset, startingAt: 1, trackDuration: 3)
videoEditor.export(exportURL: exportUrl) { [weak self] (session) in
    guard let `self` = self else {
        return
    }
    if session.status == .completed {
        let vc = VideoViewController(videoUrl: exportUrl)
        self.navigationController?.pushViewController(vc, animated: false)
    }
}