Post-edit: I’ve asked about this on #vbox on IRC FWIW. Have not asked yet on #vbox-dev. I have set up an account on virtualbox forum but have not posted there yet. But I wonder is this is a OM graphics issue?
What about try to run virtualbox with user guest?
And hover mouse over ‘Enable Video Capture’ and it says “When checked, VirtualBox will record virtual machine session as a video file”. All of which means that we have confirmed some more that this is not working for me on this computer. So time for my walking.
Enjoy your walking! 
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Are you using OpenMandriva on your host system or other? And apparently on your host system video capture is working?
Currently I haven’t OM installed on real hw.
I download vbox from virtualbox website. Video capture is working.
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ROSA? or?
Yes, ROSA and Mint.
I have vbox also in Windows but not yet tried.
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One more ? Is your VBox version 5.2.18?
Forgot to ask.
Yes, 5.2.18.
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OK, thanks, this tells us something but not sure what.
YW.
Do you think the issue could depend on some local wrong/not perfect configuration?
Have you considered to run vb with xguest user, just for testing?
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No, I have tried on another computer and on another instance of Lx 3 on this computer that is more basic, less configured. I may well try that though.
Post-edit: It is more likely something in code somewhere because the command:
$ VBoxManage controlvm Demo videocap on
does not work:
Syntax error: Invalid parameter 'videocap'
so something is preventing the command from working. The #vbox guys on IRC are baffled so far.