Screen flashing during video call on MacBook Air

I am having MacBook Air M4 ( macOS Tahoe 26.2 ) . On video call, my screen flashes in white colour along the boundary of screen just like forming a thin rectangle. It all began due to a permission which I allowed accidentally , something related to flashing in low light or something else . All I know is that it is a camera related setting . It's very annoying for me . I just want it to turn off . Please help me out of this .