any method to render outside of view ?

currently I am using Unity's videoplayer to render 360 video around the user. When loading next video, Unity will be busy to load video (around 0.3~0.5 sec) and during this gap time, rift will show hour glass icon, and the rendered part will be kept before loading video. And if user moves his head during this time, user will see the part outside of rendered part in black.

I know rift render with frustum culling based on rift's position and rotation, but I hope user still could be able to see the outside part of view (not in black) when the system is busy. I don't want to cull anything outside of view.

I would like to know if there is any method to set the render setting to render outside of view ? if so, I would like to do this before loading the video to make sure there is no black rendering for user to look around during the gap time.

Thank you!! =)