Dears , Lee & Iacrumb
Problem SOLVED !
After many hours of reading and trying, I solved the problem today.
The reason was that Kaspersky privacy protection was blocking the webcam.
I removed the protection to my webcam from software settings.
After that, I turned off the firewall protection for a short time and turned it back on.
One of these two things was causing the webcam to be blocked.
Everything is fine now and the problem is solved.
This way, I want to thank you for your time spent helping me.
Best regards ,