Available as an assembled Module and as a DIY project.
This Module is currently available.
Quad Video Inverter
The quad video Inverter is a four input, four output luma inverter which flips darks to lights and lights to darks. A luma inverter inverts signals about the 0.5v threshold rather than about 0v so that 0-1v video signals remain within the 0-1v range.
*Current Consumption has been verified with the Joranalogue Test 3 V/mA Meter.
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These merchants probably sell this module. Huh?
Foxing Hour NVRT - Quad Inverter