TomaTito on 31 March 2020
The motion controls would be done the same way as with the Wii using the accelerometers in the joycons.
And they would use the gyroscopes in the joycons to substitute the wiimotes IR pointer controls.
The IR camera in the right joycon has only been used to detect objects and distances. It could be used the same way at the IR camera in the wiimote, problems are the camera is awkwardly pointing downwards plus there is no sensor LED bar with the Switch.
EDIT: Back in 2016 a patent came out and we discussed three possible uses of the joycon IR camera sensor: gesture motions, IR pointer and biometric sensor... I completely forgot about the pulse sensor 
which they did use it in Ring Fit Adventure!
