This has a "static" demo (poor demo, at that) of a demo video capture source. From the tmhare stuff.
C++ C
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Latest commit 779875e May 15, 2012 @rdp safer
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vcam_vs_2010_demo_video_capture_project safer May 14, 2012
README yo May 11, 2012

README

simple demo "virtual camera" (fake camera) input.
originally from http://tmhare.mvps.org/downloads.htm

There is a "higher quality" dshow virtual inputter here:

https://github.com/rdp/screen-capture-recorder-to-video-windows-free

It also doesn't handle paused graphs well/right yet.
in fillBuffer:
    // If graph is inactive stop cueing samples
    //if(!m_pParent->m_bActive || m_pParent->m_bEOF) 
    //    return S_FALSE;