Anybody knows if this would be possible?
How should it? There is no real 3D data, just pixels. If you want such stuff, you have to put in way more effort and reconstruct the scene using 3D layers, 3D plug-ins, 3D programs and lots of work extracting the "textures". I'm afraid you are looking for a one-button solution that doesn't exist (yet), even more so when the footage hasn't even been shot with VR in mind.
Thank you Mylenium for your reply.
Well, the surface is flat (spherical, but no extrusion or intrusions), and that's fine. So no need to extract any 3D info. And the footage was shot "with VR in mind", but I just need to do camera drives inside the sphere, and elsewhere than only the center point.
I know CC Environment is just a perspective effect. Just hoped there would be a solution to convert the sphere created with CC Environment (or similar) to a real 3D sphere surface – and then make the camera drives inside this 3D sphere.
I don't follow. It's just an intra-layer effect, so there is exactly zero 3D interaction. You are completely looking in the wrong place. Aside from that I'm not sure how you would derive any realworld movement from a spherical projection that does not represent this stuff in any such form plus of course even if it made any sense and were possible, you'd see fuzzy pixels... I still think you are wanting the impossible.