void SetupButtons()
{
    var tapGestureRecognizer = new UITapGestureRecognizer(ViewTapped);
    View.AddGestureRecognizer(tapGestureRecognizer);
    View.UserInteractionEnabled = true;
}

public override void ViewDidLoad()
{
    base.ViewDidLoad();
    InitializeAgoraEngine();
    SetupVideo();
    JoinChannel();
    SetupLocalVideo();
    HideVideoMuted();
    SetupButtons();
}