[OS X] display live isight webcam video

I'd like to show live video (from the iSight webcam on my macbook) in a view. I'd also like to scan each frame and possibly change some pixels.
There are a ridiculous amount of APIs that I've come across in researching this: QuickTime, CoreImage, CoreVideo, Quartz, OpenGL, etc.
I found the sample-code project QTQuartzPlayer which is able to display live webcam video (and move the OpenGL camera). However, I've had some trouble dissecting the code, because of the various barely-documented API calls.
It seems like this line is the only thing that references the webcam in some way; It opens the default sequence grab component (which happens to be the webcam).
// SeqGrabComponent _grabber;
_grabber = OpenDefaultComponent(SeqGrabComponentType, 0);
It also seems that the stream from the webcam needs to be decompressed (using ICMDecompressionSession).
Anyways, can anyone give me some tips on how to accomplish this? In particular, look at/change pixels in each frame.

Apple doesn’t routinely monitor the discussions. These are mostly user to user discussions.
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
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Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.
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Welcome to Discussions, WimNL
WimNL wrote:
I have got three LED Apple displays connected to my MACPro. Now the Isight webcam is activated in the right Led display. I don't know how to activate the middle Isight webcam en de-activate the Isight webcam of my right Led display.
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(1) For iChat, you can choose which iSight you use in the "Camera:" choices bar in iChat > Preferences... > Audio/Video that appears when more than one compatible camera is connected. Although your camera choices will be different, the choices bar will look something similar to the Preferences settings shown here:
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http://docs.info.apple.com/article.html?path=iMovie/9.0/en/mov39f84285.html
iMove 8 (from iLife '09) is slightly different as explained in this article:
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