What's the correct resolution of a 360 video to be renderd on an Ipad

Hi guys, I’m doing a little project where I have to display some 360 videos ( 2 sided unlit materials) inside a sphere. The project has to work on an iPad.
The camera is inside the sphere too and I change the videos by clicking some widget buttons.
I need a little help to set up the videos correctly. What are the right specification for the 360 videos that I need to use to see it working in my iPad? On my pc everything is working, but I can’t make it work on my iPad.
Super thanks your time,