(C#) How to capture video stream without using a third party

Question

I'm newbie here, but I need some help. I need to build an application for my Foscam IP camera.

I found an interesting article on Planet-source-code.com: How to create USB webcam / IP camera recorder to capture and save video (C# WPF). This aroused my attention, but so far I am unable to find out how to implement it without using a third party SDK (such as Ozeki's C# camera library).

Any idea?