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How to get camera stream

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Posted at 1/13/2021 09:42:02     
I flashed my face x2 with linux img from google drive in download page using linux tool 1.34.
After installation, I installed opencv 3.2 via apt-get.
But when I run the Test-Camera application, I got:

Unable to stop the stream
/dev/video0 open fail

What can I do to tackle this problem?
thanks.
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