Is it possible to set up FPV with a 4 in 1 FC?

[v1b1n]

I'm currently using the Turnigy Multistar 30A, and the wiring diagram shows that you connect the VTX and Camera to the 5 volt, yet no VTX even supports 5 volts, only 7-24V.

 

[Launchpad]

Certainly does seem odd for a modern board.
There's no harm in running power right from the battery pad.
Just be sure to use a capacitor.