Welcome to the "3D printed anti spy cam slider" mini project!
I see many laptops and notebooks from which the camera is covered with a post-it or a piece of tape. I found a few 3D printed clip on camera covers with Google but I wanted something more elegant. Even if you do not have a 3D printer it is extremely cheap to get one through a 3D printing service (I recommend 3Dhubs). The print only requires 6cm of (3mm) filament.
I made this camera slider as thin as possible (1.2mm) so you still can close your laptop. The camera hole size is 7mm diameter so (I think) it will fit most modern laptops.
You only need thin double sided tape (I'm using double sided tape that I have for repairing smartphone/tablet touch screens) and a crafts knife or scissors.
The slider consists out of two parts that are really thin and small so you may need to tweak your slicing parameters to get a good result (especially extrusion widths). Also you must print with 0.2mm layer height (or 0.1mm) and 100% infill. Because this thing only has 6 layers and some areas are only 2 layers thick you need to be sure the first layer is perfect. As a reference I attached my Slic3r configuration to this step. I printed both parts together and the print only took 6 minutes. Here is a time lapse video of the print (x64).