void SetupLocalVideo()
{
    var videoCanvas = new AgoraRtcVideoCanvas();
    videoCanvas.Uid = 0;
    videoCanvas.View = localVideo;
    videoCanvas.RenderMode = VideoRenderMode.Fit;
    agoraKit.SetupLocalVideo(videoCanvas);
}
public override void ViewDidLoad()
{
    base.ViewDidLoad();
    InitializeAgoraEngine();
    SetupVideo();
    JoinChannel();
    SetupLocalVideo();
}