Hi @Mellowyellow if you swipe down you will see the quick Settings Menu,ensure Camera Access is Switched on. As @Glenntech has said you can choose which apps should have access. Go to Settings-Privacy - Permission Manager to adjust these settings. For instance in Samsung Internet and Chrome you can choose Allow whilst using This App,Ask Every Time or Deny. This is also explained in this short video.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .