Looks like a shaft drive in the video.

I don't think anybody is making retrofit kits for shaft drives (without a lot of customization). There are a few people that retrofit belt drives onto bikes, but they often require modifying chainstays or seatstays to allow for an unbroken chain. Perhaps folding bikes and bikes with single stays?

I have an Incline Cross 7 shaft drive frame that I was going to play around with some.

The bottom bracket is oversized.
The right rear dropout is custom shaped.
The left rear dropout descends more than typically found on chain drive bikes.

It appears as if the shaft is made by Sussex.
Sussex Enterprises - Innovative bicycle components for Shimano internal hubs. Shaft drive bicycles, chainless bicycles, road bicycles, mountain bikes.

I certainly think there would be advantages of a shaft drive for a simple town bike. Whether we'll see more of them, I don't know.