The hacking of webcams is all over the news here in The Netherlands.I decided to block my cam with a 3d-printed part. It is designed for the HP EliteBook 8570w. It's a long shot, so if this is not your laptop, maybe you can use this as inspiration for your own privacy and/or use the Solidworks file.
I printed this on the side, because I think now it is stronger for where it is used for. Therefor there is not much surface on the printbed. Maybe printing from the back will be fine too.