It's not possible to render sub-windows on the Oculus with recent versions of Vizard. The following is from the Vizard docs:
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The Oculus SDK is provided the rendered image of the world and automatically performs the distortion correction before displaying the image in the HMD. All other rendering performed after the world (i.e. screen objects and sub windows) will not appear in the HMD. You can use GUI canvas nodes to display UI to the user with proper distortion correction applied. See the Oculus example script for sample code.
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You could try using a render node to display a different view on a quad rendered in the world. The renderNodeSimple.py example script (File > Quick Open: type 'renderNodeSimple') shows how to use a render node. The
node.setReferenceFrame method with the viz.RF_VIEW flag can be used to fix the quad to the screen.