Hi Egon,
Indeed you just need to buy a BeoLink converter (my type is 1611, maybe your type would be 1614), with a Masterlink input on one end for MX8000, and a datalink on the other hand for your BeoCenter (connected to the AV/AUX input).
The Masterlink setup is straightforward, there's no menu for that on your MX, simply a configuration process that is done with your remote control , depending on the location of each audio/video device & the way you want to control them.
Reunion Island is greeting you!