It turns out that the argument to cvWaitKey() is the timeout value for waiting for user input. Passing a zero (0) to this would make it hold until user presses a key.
Spent a few hours today to look through the AdaptiveSkinDetector sample program. It is an exercise of the cvAdaptiveSkinDetector module. The program expects a series of frames pictures split from video or actually grabbing frames from a the webcam input. The thresholds of skin is just a range of Hue values. The adaptive part comes in as it adjusts the range based on the histogram collected going from frame to frame.
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