To avoid distortion of the projection, your player must be in the center of the sphere. To avoid fish eyes. I need to think about the curvature of the projection, but so far I have not planned to add this functionality.
You can check the performance of the player in a Packed demo.
The video player uses standard media player tools, and optimizes video playback using the gpuhttps://youtu.be/OhxGXt6GpO0