Implement video sources and other elements for MS Media Foundation

Submitted by Christoph Rackwitz

Link to original bug (#742558)

Description

Since ksvideosrc seems unmaintained and throws 'write map requested on non-writable buffer' errors, I went looking for dshow support. I found dshowvideosrc, which appears to have been abandoned in 2008.

I'd like to read from a webcam with gstreamer on windows. That could be done with DShow or MSMF (newest API). Kernel Streaming (ksvideosrc) is deprecated now.

Version: 1.4.5