Fast guide:
* Be sure to turn off any in camera stabilization in Sony cameras.
* Be sure to take the added crop into account when composing.
* The faster shutter speed, the better. Forget about 1/50 for 25p. There will be the most horrible artifacts. For 25p, use 1/100 or preferably use 1/200. For 50p, use 1/200 or preferably 1/400 etc.
I also expect purely gyroscopic approach to be much lighter compute-wise.
For context, the webpage: https://www.qtav.org/blog/new-sdk.html
The result was pretty good and it was super easy to do it.