Those notifications have two parts:
- a game object that defines their position in space
- depending on the used GUI system, a legacy GUI displaying the actual content at the position of the game object, or a new UI game object on the canvas created by ORK
The legacy GUI can be rendered on a camera by addinng the GUILayer component to it (which usually is added automatically). There's currently no way to differentiate between different parts of the legacy GUI, so you need to remove the GUILayer component from one camera and only add it to the one you want to display those things at, but this will affect all other GUI elements as well.
The new UI is displayed on layers, and there's a layer setting in ORK's new UI settings. So if you want to render stuff only on one camera, remove that layer from the others :)