Hasta La Motion!

I have been think about this for a while now and wanted to get your thoughts on this:

Would it be possible to build some kind of device that you can strap to the camera and that records the full 3D motion of the camera?

I know that devices like the iphone contain an accelerometer that can record at least the rotation of the device, although I think the data of such a recording is not accurate enough for our purpose (for a 4k picture I think you would, depending on the lens, need a accuracy of 0.005 degree). But are there accelerometer like devices that are more accurate? Also is there something that can record the movement to a accuracylevel that would be useful?

On the other hand I think a rough 3D track of the shot (by that I mean a path that is not spot on, say for some 1-5% off, created by an iphone app or something you strap to the camera) could be very useful information for the starting point of the full spot on 3D tracking of the shot.

What is everyone thought on this? If it would be possible it would be a great tool!

Anxious to hear from you all!

Greetings!
Kasper