Object tracking in 360 footage

I am trying to track objects in 360 footage so that I can add 3D objects. The scenario is that the camera is walking and while advancing to an object I want to add ,as an example, a text to the object. As an end result this will be 360 VR video so the attached text should also be visible and still be attached when you turn back in the VR environment.
Hope I could make my point clear