Combined with your other question
How do I know if there is a computer camera?[
^] I find myself wondering exactly what you are trying to do. I can't easily see any legitimate application which uses a PC camera and wants to hide.
I can however see quite a few illegitimate applications, and most of them are extremely repugnant.
As a result, I have down voted your question.
If you can explain to my satisfaction what your app is doing that needs these two in concert, I will reverse this vote, and may even answer it...