Video from Virtual reality presentation template.
Prezi template where big Virtual Reality headset image is a front layer and a picture from earth is a 3D Prezi background. Add a video behind the Virtual Reality image background layer, import .mp4 video and send it to back with right mouse click.
Change Prezi 3D backgrounds to anything else and a first layer, that is a Virtual Reality gear with transparent area in the centre will make it seem that you are seeing the background through Virtual Reality glasses. Zoom in and earth background disappears, another grey background with gears appears.