Camera Capture WPF 4.5

I was wondering how to capture an image using a webcam in WPF 4.5

I tried following the example at
http://www.codeproject.com/Articles/285964/WPF-Webcam-Control

But i think it may be a little outdated for Windows 8 Desktop applications

I get an invalid cast exception when i start the camera.

Is there any way to capture an image on WPF 4.5?