The November 20 beta update has a Camera Setup page on the SteamVR Dashboard for Reality Mixer. There you can adjust the camera rotation while in VR.
Old text:
Here's a temporary fix for the rotated view on HP G2 v1 headsets.
- Update to the new beta (version 0.12.0.6).
- Run the app once in SteamVR.
- Quit SteamVR (or just the Reality Mixer app).
- Find the .xml settings file in the install folder of Reality Mixer. It's named like RealityMixer_Settings_RoomId-[some number].xml.
- Open it in Notepad.
- Find the entry for parameter "LeftCameraRotationZ".
- If you have a HP G2 v1, set it to "0".
- Save the settings file.
- Start SteamVR and the Reality Mixer app.
Please share your experience and let me know how well (or bad) the image lines up with the real world when using a G2 v1.

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Changed depots in internalbeta branch