I am thinking something in the drive line. If it was a wheel bearing I would think it would change pitch when leaning left or right. I did not hear a change in pitch when you moved the camera. Have you tried going downhill in neutral killing the engine and just coasting? That would remove the influence of torque on the noise. I would think the torque would be reduced at lower speeds thus making the noise go away. But I am fairly confident that your noise is in the drive line. Good Luck!