Camera issue after update sequia in mac air m1

Hey,

In my mac after update mac os sequia the camera not working on phone booth and face time I tried many possible ways to troubleshooting this issue but fail.after update green light also working and also checked hardware In the system information it read but camera not worked after a day I again checked and this time flash is not worked and also system not read any camera.Is this a software issue?

If the hardware issue then why system read correctly camera a day before