How to normalize 360-degree videos so that certain object / person remains in the middle?
You may have sorted this out by now, but I saw the open question, so I thought I'd answer it.  

If you have a subscription to the Adobe Creative Cloud, you can now do this reorientation in Premiere.  In June, Adobe bought out the Skybox plugin from Mettle.  Essentially, that plugin allows you to re-orient your 360 video in AE or PR among other things.  

There's now an effect in Premiere called 'VR Projection' and it allows you to adjust the pan, tilt, and roll of your projection.