//Alternar entra WebCams
private async void MenuWebCam_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
int indice = menuWebCam.Items.IndexOf(e.ClickedItem);
if (indice != _webCam.WebCamAtual)
{
menuWebCam.Enabled = false;
await Task.Run(() => _webCam.MudarWebCam(indice));
menuWebCam.Enabled = true;
}
}
