Any camera inside will have a limited vision (looking down one bee space) and quickly be covered in propolis and probably wax. There are examples of cameras pointing at entrances or into an apiary in general, the usual weatherproofing questions apply.
Your choices are either general security cameras which might not focus close in but are often designed to be mounted outside or something similar to what people mount in bird boxes. The picture could be analogue, either by a co-ax cable (like a television aerial but RF signal) or wireless (not usually wifi) that would be to a monitor, a CCTV recorder or specialised board in a computer. Or it could be a digital signal. Digital could be a computer network cable (cat5, say), wifi (if there's a decent signal) or USB cable (webcam style). All the variants apart from webcam need their own power supplies, a webcam has a limited cable length from a computer (5m or so, but there are extenders). All come at various price points and weather resisting qualities. More variants than could be covered here. As suggested Maplin is a reasonable starting point to see what CCTV, webcam and other camera setups actually look like.