Starts the camera
Note that if you want to use WebCamTextures in the web player, you need to get the user's permission to do so. Call Application.RequestUserAuthorization before creating a WebCamTexture.
// Starts the default camera and assigns the texture to the current renderer
function Start () {
var webcamTexture : WebCamTexture = WebCamTexture();
renderer.material.mainTexture = webcamTexture;
webcamTexture.Play();
}