GenerateThumbnail.swift

func createThumbnailOfVideoFromRemoteUrl(url: String) -> UIImage? {
    let asset = AVAsset(url: URL(string: url)!)
    let assetImgGenerate = AVAssetImageGenerator(asset: asset)
    assetImgGenerate.appliesPreferredTrackTransform = true
    //Can set this to improve performance if target size is known before hand
    //assetImgGenerate.maximumSize = CGSize(width,height)
    let time = CMTimeMakeWithSeconds(1.0, 600)
    do {
        let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
        let thumbnail = UIImage(cgImage: img)
        return thumbnail
    } catch {
      print(error.localizedDescription)
      return nil
    }
}