VideoStreaming6.swift

player.addPeriodicTimeObserver(forInterval: CMTime(seconds: 1, preferredTimescale: 2), queue: DispatchQueue.main) {[weak self] (progressTime) in
    if let duration = player.currentItem?.duration {
        
        let durationSeconds = CMTimeGetSeconds(duration)
        let seconds = CMTimeGetSeconds(progressTime)
        let progress = Float(seconds/durationSeconds)
        
        DispatchQueue.main.async {
            self?.progressBar.progress = progress
            if progress >= 1.0 {
                self?.progressBar.progress = 0.0
            }
        }
    }
}