There are two different ways I have used my computer's webcam:
1) When I discovered that one of my employers was offering an on-line tutorial, I immediately enrolled. The day of the session occurred and as part of the login for the webcast, my computer's camera was activated. The presenter and the employer were able to verify all in attendance.
2) Last year I applied for a position and was interviewed using Skype. The Hiring Manager and I both sat at our terminals and covered all of the details of the job. As I got hired, it is another success story for having my computer camera.
I look forward to the day when I will be able to provide instruction and facilitate discussions using the webcam on my system. To the future -