Are you doing this from the Samsung Camera app or a third-party camera app or an app that has a function to use the camera? The Samsung Camera app should have no security restrictions on it, but you can check its permissions by long pressing on the camera app icon, tapping the circled "i" on the upper right and making sure where it says "permissions" all the permissions are enabled. If you see the camera does not have permission, tap that section and add it. Do the same for any app for which you want to use the camera from within (such as Zoom or Facebook), even a third-party camera app.
