Sort of.

I think in the video you linked, what's being shown is an instance of VCV Rack representing the modules running within the MetaModule, and there's a non-interactive MetaModule faceplate in that rack that you can use to map from the real MetaModule's controls to the virtual knobs of the modules it's running. Which is a pretty cool interface.

But I reckon what the GP is asking is for a real interactive MetaModule within VCV Rack, running the real firmware - i.e. VCV Rack hosts the MetaModule, which hosts VCV Rack, which could presumably host another MetaModule, which could host another VCV Rack ... etc etc.

You can host Cardinal inside of Cardinal inside of ..