createVideo.swift

func exportVideoWithWatermark(inputURL: URL, outputURL: URL, watermark: UIImage) {
    guard let composition = addWatermark(to: inputURL, watermark: watermark) else {
        print("Failed to add watermark")
        return
    }

    guard let exportSession = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetHighestQuality) else {
        print("Failed to create export session")
        return
    }

    exportSession.outputURL = outputURL
    exportSession.outputFileType = .mp4
    exportSession.shouldOptimizeForNetworkUse = true

    exportSession.exportAsynchronously {
        switch exportSession.status {
        case .completed:
            print("Export completed")
        case .failed:
            print("Failed to export video: \(String(describing: exportSession.error))")
        case .cancelled:
            print("Export cancelled")
        default:
            break
        }
    }
}