Hello there Oostervrouw,
We understand the quality of your Mac's camera isn't what you expect it to be. Let's take a closer look as we do our best to provide some additional insight.
To get started, can you tell us any other conditions where you observe this? For example, are you in a bright/properly lit room, or does this only happen in dimmer light, etc?
Also, what apps have you tested the camera with so far? Does it show the same in all apps? Be sure to note that this model only has a 720p camera, so it may not be comparable to some other devices like an iPhone.
In the meantime, we'd also suggest trying the rest of these general troubleshooting steps mentioned here: If your built-in camera isn’t working on your Mac
However, you may also need to take your Mac in to be inspected in person.
We hope this helps!
Take care.