OVRdrop is a Utility Application for SteamVR that can mirror a Desktop Window, an entire Monitor, or a WebCam into a Cross Game SteamVR Overlay. OVRdrop works on SteamVR and should be fully compatible with any SteamVR headset, though you will need tracked controllers for many of the features. It is known to work for the HTC Vive as well as the Oculus Rift, though some games may not be compatible with the Rift. The only major downside is that Cross Game Overlays will always draw on top of game geometry because Depth information is not fed to the Compositor by SteamVR