skype does not show the camera on one of our Macs

We have a few Macs. O n one of me Macs, when we use Skype  the camera does not show up.
The camera works fine since it works when I use it with other apps such as facetime .
I have tried installing the latest version of Skype  and also going to older versions but same issue came up.
Skype works fine, just the camera does not show up at all. It was working fine till two weeks ago.
I also tied logging on as different user but same happens.
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netcompAuthor Commented:
Thant work great. Thank you
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