simple housing for the camera.
holes for the wires, the board is attached to the 4 ledges.
standard lens is screwed into the tightness of the hole.
For a cheap camera bought on aliexpress: "1.0 MegaPixel CMOS ONVIF IP Camera Module IPG-60H10(38)PL-S, Hi3518C"

Hole for the lens will likely need to modify with a file or knife.
But not too much, otherwise the the lens falls.
If you use a light or clear plastic, it will be necessary to paint the inside with black paint or marker, so there was no glare.