Thank you for the screenshot.
You have a Lenovo Yoga C640-13IML Laptop.
1
On that laptop model, there is a small privacy slider beside the webcam lens above your screen, ensure that privacy shutter is open.
2
On your keyboard, the F8 key controls the webcam, try pressing that key or Fn + F8 to see if that enables the webcam.
3
If that does not resolve the problem, below is the support page for your laptop on the Lenovo website, from there, you can download the installer for the webcam drivers.
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