Take photo in unity

Hey, I'm trying to build a program that takes your photo and places it with a different background, like a monument or so. So far, I was able to turn the camera on when I start the project with this code

     webcamTexture = new WebCamTexture();
     rawImage.texture = webcamTexture;
     rawImage.material.mainTexture = webcamTexture;
     webcamTexture.Play();

     Texture2D PhotoTaken = new Texture2D (webcamTexture.width, webcamTexture.height);
     PhotoTaken.SetPixels (webcamTexture.GetPixels ());
     PhotoTaken.Apply ();

However, I can't take a screenshot or photo because it always ends up all black. I've tried different codes but nothing is working. Can someone please help? Thanks