Virtual Reality - HTC Vive VS. Split-Screen

Hi.

I thought to make a simple prototype.

I just want to know how it is possible create a “HTC Vive VS Monitor\Split screen” game, so who plays the VIVE can’t see what appens in the screen and the player who watch the screen cannot see what appens in VR.

The player on monitor has a third person controller, meanwhile the player who dress the HTC plays in first person.
What I need?

Thanks.