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multimedia 5E0035871A, dose it support rear cam view?

Hi everyone, i have an octavia 5e 2016 basic model w/o a rear cam view. so i want to install one on the rear door handle. my car DOSEN'T have the CD part in the glove compartment, only the basic genuine middle multimedia. I have done the RCA connection done to the blue connector in the main multimedia (pins 6,12) and enable bit 19/4 for RCV via obdeleven successfully (coded only 19/4). now when engaging the reverse, i see that the screen switches from parkin sensors to black for video display, but only for 1 sec and then an error massage that no video signal is found, press OK and back to parking sensors view. i used a canon digital pocket cam for video signal out (working ok on my TV) but not in the car. please advise , if everything i done is ok and when purchasing and installing the cam with handle it should work (canon not good for the test?). or should i connect rca to other pins in main multimedia? or need to code more bits via obdeleven? also please notice that i checked with dvm the rca as it is connected now and i see that ground and signal are shorted? is that ok too? ( pins and connections are double checked and looks ok). Thanks for any help or advice...