the Oculus rift tested by Norway.
I know it. It's a tech that is yet to see employment on fielded armored vehicles yet when it is.
( And I feel that is a When) The problem is the System will alleviate some of this but not enough to make a 2 man crew, also it's not ready for prime time.
First the lenses in that system trial are not yet mil spec. as you and I know Kwai there is a world of difference between the glass in a civilian vehicle and that used by the military. it needs to take the extremes of sand, dust, snow, rain, ballistic threats and worse. that demands armored glass which is not so much glass as armor it needs to be at least about UL 752 Level 8 ( able to take 5 shots of 7.62mm rounds be for failure. the Rift demo was civilian lenses. best would be a Aluminium oxynitride base which might get UL 752 level 10 or a single shot of .50 cal.
next the goggles are not perfect. there is eye strain, vertigo and weight issues. headaches are common this means that the crewmen using the system is more likely to be rotating on and off, On For Areas of known Threat. Off for long hauls.
I think the best crewmen for the rift are the driver and the Commander but not the gunner role.
driver as the input would allow for navigation seeing what is where and if there is a compact car pulling out into the road, commander as it would allow him to virtually stand up in the turret and direct and spot.
the gunner however acts more like a sniper his vision is meant to oriented around the main gun and it's reference. this makes him better suited to the existing flat screen displays. but The Commander and Gunner might be able to trade off with each other on using the Rift for keeping watch. One will use it for a set period well the other rests his eyes and brain for a few moments. That would not be a option for a 2 man crew.