So people do not yet have direct access to the gyroscope and accelerometer?Well, I mean... It has a 3-axis gyroscope and accelerometer.
If there isn't one already, it should be possible to make a homebrew that initialises and sends gyro information to a computer on the local network.
EDIT: Speaking too soon, I'm not entirely sure we can use them yet...
Thank you! Sadly I would not have a clue what I am doing. I only have moderate experience with VB.net and a little bit in C#.I've done a little digging around, and it appears as though it IS available via libctru.
As for it being available as a Homebrew application right now, I'm not sure, but it is implementable. If nobody chimes in with an application that does it, I might take a crack at it.
Source: https://smealum.github.io/ctrulib/structangularRate.html
Yeah there is unfortunately i do not have the New 3ds.I think there's a head tracking demo included in the homebrew starter pack.