Generates the image of a helmet black that has the small camera of a cell phone

generates the image of a helmet black that has the small camera of a cell phone behind it, the cell phone screen must be in front of the helmet pointing inside the helmet, so that whoever uses the helmet can see what is happening behind him through the camera and the cell phone screen. The camera must be attached to the helmet and connected by cables to the cell phone screen that is in front of the helmet pointing towards the inside of the helmet.