Shows VR late


when I start my packaged game he shows on the screen: First the intro movie, then the normal scene rendered for the display, after a second he switch to vr mode

On the HMD (Oculus DK2) he shows: Just the scene rendered for the VR, but before he is black.

I want that he shows first the intro movie then the rendered scene in vr.

Problem is, that he change to VR in runtime, how can I change it? We build a application for customer and it should look good on the display, so this is not an unimportant problem.