private async void MainPage_Loaded(object sender, RoutedEventArgs e)
{
await _captureManager.InitializeAsync();
VideoFeed.Source = _captureManager;
await _captureManager.StartPreviewAsync();
await _captureManager.StartRecordToStreamAsync(MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Auto), _stream.AsRandomAccessStream());
}