VTU.ng is using Porto theme, it is a wordpress theme.
To be honest, I can not tell the wordpress plugin the site is using for vtu but from my research.
It seems to be highly edited and coded from scratch on wordpress specifically for the site, that is custom plugin (not for public use).
But if you are looking for vtu wordpress plugin, consider using vtupress plugin.
And get Porto theme, you might achieve something like that.
You can see vtupress site demo
To get vtupress plugin, go to vtupress.com
Do not know how to set it up.
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