Phonon and webcam

[Radagast]

I'm using MSVS 2008 and Qt 4.4.1 (configure blablabla -phonon yep)
And as Phonon in Windows is based on DirectShow and usually Windows C++ programmers use DirectShow to get access to a webcam, I suppose that there must be a trivial (but not mentioned neither at the Phonon official website nor nowhere else in google ) way to present a webcam device as a Phonon::MediaSource::Stream or something like that?
Thanks in advance.

P.S. I know about OpenCV, but I'd like to try tools that I already have.