You can't? Here's a MacRuby script that can take a photo with your webcam: https://github.com/pioz/snappy.

Now, given the content of the article a moment ago, the question becomes: "Should I trust science_robot? Or is this a trojan?"

Well, just learn ruby and read the source code of snappy, then write your own camera activation code -> no problem. If you don't trust your link, go to the well known github website and search for the project yourself.

"With growing wish for self responsibility comes growing need for power."