Currently when using the camera match utility, the "screen" coordinates don't work with 2D Pan zoom. If you place a point and then scroll across to another part of the backplate, the points slide around your screen.
If we're trying to match up to a 4k backplate (or higher) then it's very difficult to get a fine level of control.
Alternatively update the utility to let users assign the positions on a separate image that you can pan and scroll around.