(However, over time, as the CCD chip ages, other pixels will deteriorate.)
It is only necessary to find the errant pixels.
That can be done by capturing several frames in a dark (no light whatsoever) space with different shutter speeds. Once that is done, you have have the locations where the pixels are defective.
Check those against the video in evidence.
If the location of the defective pixels in the control frames, match the locations of defective pixels in the video, then that camcorder was the one used to make the video.
The other question deals with quality control at the factory.
It seems that the question is:how you would calculate the numbers in these three situations
To which customer:
1. a particular high-paying customer;
2. the less discriminating customers ; or
3. the even less discriminating customers
can we sell this defective camcorder?
Without knowing the probability that a defective pixel will occur on the chip, it's almost impossible to give a meaningful answer.