If anyone is thinking of doing this mod here is the process I used to connect the mini iosd video cable to my existing fatshark camera cable. I open up the shielding on the cable that goes from the camera to the fatshark transmitter. There are 3 wires inside mine. 1 red wire which I understand is power, 1 white wire which is the video cable and a black wire there was an unshielded twist of steel cable that was the ground or black wire (it is black at both ends where it attaches to connectors, but inside my shielded wrap of this cable the ground is bare)
From the mini iosd my cable has 4 wires brown, orange, brown, yellow and were it plugs into the mini iosd the first is gnd and that is a brown wire, I combinded both brown wires into one and soldered them to the ground wire that I had exposed when I removed the shielding from the cable from camera to transmitter. So now both brown wires are addressed, the next is the orange wire which is labled video out. At this point I cut the white wire and on the end going to the transmitter I solder the orange wire. The yellow wire, the last one, I solder to the white wire going to the camera. I recommend you slide litte shrink wrap tubes onto the white wire prior to soldering and then pull up and shrink wrap the wire wires professionally. On the brown wires where it was soldered to the ground wire, clean up nicely with electrical tape. I then shrink wrapped the whole assembly, I built it so that the ends that connect to the mini iosd and to the transmitter were the same length, you might want to consider having a different length for your assembly.