not even that unthinkable, at least for basic machine vision (4k recording are probably not going to work). Powered by induction and using low power electronics might be able to get there; although if you arent fine with implanting induction coils in your cheekbones or under your eyebrows with attached energy storage implanted it might be a bit invasive. At that point it would be preferable to develop Cybereyes - a biointerface connecting your eye nerves using a biochip paired with a camera; the space that's left in the eyesocket is probably big enough for enough energy storage for a day. Don't forget to charge overnight tho, you might go temporarily blind.