Unauthorized access of webcam

So I installed an antivirus on my mac air which has some features to prevent an applications or websites from using my Mac's webcam when I don't know and I found out that every time I'm open an AppStore it attempts to access my webcam and this attempt is blocked and reported by my antivirus

So I want to know why some system apps on my mac are accessing my webcam without my permission and what data about me are collected in such way?

I'm not really concerned about privacy,but I think that I must know,understand and control what my system does because it really violates my rights for privacy and security