I haven't played with the video too much on my D7000 yet, but the first question that comes to my mind is the quality of the lens on that device. What's the point of recording in HD if the lens on the camera can't deliver high resolution images?
I have taken HD video with my Panasonic GF1 - I was able to mount my Sigma 800mm lens on it with an adapter. I'm quite sure the Benq would never be able to deliver the video quality I was able to capture with that setup. I'm sure the same is true with the D7000.
You have a 150-500mm zoom. You should be able to capture awesome video with that lens mounted on the D7000. I think I'd try that first.