Long time ago I’ve faced the same problem. That was cocos2d-iphone. Solution was - update physics and camera at same -(void) update: method. Worked well.
Now in another game with cocos2d-x this solutions not works well, sometimes I’ve got jitter.
Moving next - this thread helped me a little bit How to fix Jittery Side Scrolling with Box2D why little - because jitter is still occurs sometimes and really badly, but I’m still not using interpolation… in my game only one main character is physics dynamic body that moving, all other is just static bodies and so camera follows this character… also Fixed Time Step and Box2D
Actually, now I’m facing same problem, I can’t fix jitter. But I’ve today implemented interpolation but anyway jitter is there…
Is anyone can help with this? Maybe post working solution code? I just don’t know, I did all as in my links, but still…