I have a 2005 TSX with navi

I was able to hook up my backup camera on the 1st video input.
For the 2nd video input it's asking me to connect the green wire to the handbrake. Is there a way for you not to set your handbrake on and be able to watch video while driving? I would like to have this going through a switch or some sort and by flipping that switch on, it will override Video 1 and the navigation map screen.
Someone must have done this, please with the instructions or what I might need to buy extra to make this working.

Thanks!
Tuon

 

Please post in Audio Video section.