// Save output video

import Photos

func saveVideo(url: URL, completion: @escaping (Error?) -> Void) {
PHPhotoLibrary.shared().performChanges({
let assetChangeRequest = PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: url)
let assetPlaceholder = assetChangeRequest?.placeholderForCreatedAsset
guard let albumChangeRequest = PHAssetCollectionChangeRequest(for: PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, options: nil).firstObject!) else {
    return
}
albumChangeRequest.addAssets([assetPlaceholder] as NSArray)
}, completionHandler: { success, error in
if success {
    print("Video saved successfully")
    completion(nil)
} else {
    print("Error: \(error?.localizedDescription ?? "")")
    completion(error)
}
})
}