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I am trying to display the camera video with VLC vlc v4l2:///dev/video0 but so far all my attempts failed. I tried different SO answers like here.

But the error I am getting is still the same:

cannot start streaming: Input/output error

not a radio tuner device

open of `v4l2:///dev/video0' failed

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I finally succeeded to make my cams work. Actually I was using Ubuntu in Virtual Box. And to display the cam streaming in VLC one needs to download Virtual Box Extension Pack here. As a result, there is a new entry "Webcams" option in the Devices menu when the virtual machine is running. One can select the cam to use with this option.

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