Intensity Extreme + Sony PMW-Ex3 + iMac

Hello and welcome!

I have difficulties with connecting my Sony PMW-EX3 to iMac via Intensity Extreme.
I connect camera through S-VIDEO cable to 8 Y-IN and 9 B-Y IN and then through thunderbolt to iMac.
The BlackMagic Media Express does not capture any video... I am sure that my camera "sends" the video through. Also I can hear that Intensity Extreme is running.
Can someone please help me with that?

WORKS!!

system settings -> blackmagic design -> SET INPUT -> set what you need (for example S-VIDEO)