There are VR cameras. It's how the shoot VR movies. They are usually limited to 180* (though 360* 3D camera do exist) obviously a fixed position, but you can look around and they give you a 3D view which spans 180* vertical and 180* horizontal. The 3D can really bring things into life-like, especially things up close in your face. I have no idea of the cost of availability though. i wouldn't imagine they would be that expensive as 360* cameras are readily available, a 180* 3D camera can't be that much.
On pixelation. With the Oculus if you stare off into space, you can see what they call a "screen door effect", in that if you concentrate you can see the pixel boundaries. However when immersed in a game or movie you really don't notice these, you actually have to look for them to see them.
For gaming the resolution is adequate but is not even quite as good as a solid 1080p monitor, or at least that is the perception. The screens from memory are 1080*1200x2, yes they are vertical aspect and the mirror on the monitor for some games shows this with an odd vertical narrow window. When people upload videos they usually crop them, like I did in the one below.
On zooming down a tunnel vision, tele-photo style. This is where the immersion actually starts to hurt. The oculus does such a good job of tuning into your natural vision centres that when you do anything that your brain does not expect you can feel nauseous. In the video below there might be one or two moments I use the "VR Zoom" function and it can be a bit upsetting. I'm fine with it, but looking around while zoomed in can be a bit freaky.
On nausea, I am usually fairly okay with things, so much time spend flying in flight sims and FPV I'm resilient, but a few things have brought me close to barfing. Playing games where you walk around using the keyboard can be slightly naseating, especially if you also rotate with the mouse as your brain is confused by apparent visual motion of you body it can't account for. But the one that immediately made my remove the headset was when the Flight Sim in the video below had a bug where when you re-flew a mission the VR coordinate system reversed itself. Looking left moved your vision right, up was down and moving your head side to side went in the mirror direction. That immedaitely caused me to wretch and remove the headset!