I just deleted the noise sounds from the system. If you want them for later, you can just move them to a different folder on a sd card. I believe you have to be rooted to do this though. There are 2 for the video recorder and 2 for the camera (actually I believe there is 4 but I think you only need to delete 2 of them).
If you are rooted, use root explorer (I'm sure other file explorers will work too, but I know I couldn't find them with ES File Explorer) and go:
system > media > audio > ui
the files I deleted are:
camera_click.ogg
Camera_click_short.ogg
Shutter
Shutter multiple
and for the video recorder, I deleted:
cam start
cam stop
again, I don't think you need to delete them, just in case you want to put them back, just move them to another folder (might have to be on an external sd)... but I deleted them and have had no problems