oculus radar second camera

Yes, this is possible. I think you just need to set the camera to a render texture, and then put it on a quad.

is there a tutorial to render the second camera as a texture ?
to do this please ?

If you search for "Unity minimap tutorial" there are a bunch of hits.

I did a quick search, and this video seems decent (though I didn't watch the whole thing):

https://www.youtube.com/watch?v=EeyZ2y2Jpz4

thanks so much ...
i know how make a radar (map) on unity.
my question is how render as a texture......
if not, the radas goes to background to infinity place, on OCULUS LENS.....
and the radas works but not for VR.

i need to know how to render the second camera like a texture tu use on some 3D object inside the scene.
thansk again . so much
any idea ?

Try using GrabPass in your shader to read back the previous contents of the eye buffer. http://docs.unity3d.com/Manual/SL-GrabPass.html