Install Sunvisor and Headrest screens

I want to install sunvisor screens and headrest screens in my car. Does anyone know how or where I can get information on how to get the cables from the back of the car to the screens themselves? I need to get the cable in the floorboard to get to the headrests and in the roof panel somehow to get to the sunvisors.

Any comments would be greatly appreciated. Thank you very much.