This guy have a similar problem:
I tried unchecking the lock to cursor but it STILL doesn’t appear, it ONLY appear from the camera’s perspective, this indirectly means there is no way to manipulate the camera using the gizmo !
Incase of Fanboy reply: “You don’t need it anyways ! Just press G and then ~”
Yes, I know this, I want the gizmo, is this a bug ?