Imac late 2015 27" inbuilt camera settings

Hello,

I am wondering if somebody has suggestions or knowledge about optimising the inbuilt camera functions and quality. I noticed that the picture quality of the camera is poor, blurry and overexposed. I have changed the environment light but the problem persists. The image is very unfocused and blurry. Are there some applications or software one can download to be able to improve the cameras image quality?

So thankful for tips or guidance!

Sooz