It will be very conviniant if there is such a node, which convert the texture coordinate to a ground projected texture coordingate in the world shader editor, just like this
https://www.youtube.com/watch?v=kDtz_lpWi4g&t=312s
I think the calculation should be like this
the green cube is the bounding box of the camera in blender, and the orange cube is the bounding box of the camera who shot the HDRI