Hi Satyanarayana-
I'm Kevin B. Independent Advisor and a Windows user like you. I do apologize for the inconvenience that your experiencing right now, let me help you sort things out.
Kindly run a windows store apps troubleshooter on your settings.
Go to settings > update and security > troubleshoot > Get up and Running
Look for Windows Store apps > run troubleshooter.
Check if the camera will work properly.
Or, kindly reset your camera app and see if that will address the concern:
Go to settings > apps >under apps and feature look for camera.
Click on it and click advance options > scroll down and click reset.
Close settings and see if the camera is working.
Please do let me know what will happen. Hope this will help and have a blessed day!
Thanks.
Kevin B.
Independent Advisor