Vista - WebcamPlayer instead of MediaPlayer? How?

I'm having some trouble figuring out how to do this: I've developed a
camera library in C++/CLI which I use further in C# apps. After making
it accessible to Windows Forms and Direct3D, I want to give Avalon/WPF
a try, but this is where I got a bit stuck (lack of proper
information). As you can see from the thread's title, I want to achieve
the same functionality that currently is given by
MediaElement/MediaPlayer. I want to be able to output my webcam preview
video to any Visual element in WPF. How do I do that? Do I need to
subclass MediaElement? Or MediaPlayer? Or something else. And how do I
customize it? I hope someone has an answer to this really soon, I'm
betting my final year project on this.

Thanks in advance,
Cosmin.

P.S. Also, I want to know if C++/CLI can be used to subclass the
controls, or it has to be done in C#.

I think you can use your own custom file to trigger the calling of your
camera lib (as a source ) for media player to play it. The hard thing
is you need to know directshow and you need to write a directshow
source filter for that custom file. The key of my idea is if you can
play a file using media player then you can use it in WPF mediaelement.
Are there any easier way ? I want to know it too.

Wisut.

Well, all the work is done up until rendering. I use VMR9. I can render
both in Windows Forms (Windowless mode) and Direct3D (renderless mode).
I am trying to use renderless mode to display in WPF also. Of course,
you have a point there, but this would change how my library works. I
just need this final step to be able to output in a 'MediaElement'-like
fashion.