It isnt, the thread is perfectly fine as long as nobody replies detailing how it would be done...
In reply to your question, yes, im pretty sure an experienced hacker could do something like that if he/she was given time and resources, its not impossible, but highly improbably considering you are just one of billions of people. Unless you've ticked off some rather large government departments... no one is going to be looking for your webcam in the first place.
dragon2309