Creative Live! Cam Sync HD 720p not working

Just bought this Creative webcam for a 2009 Mac Pro (El Capitan). Can't get image in any application* with this brand new cam, but micro is working and recognized properly by the system prefs (audio input).

But recognized perfectly plugged into an old MacBookPro running under Snow Leopard.

Any thoughts what may be wrong? There's no drivers available cause it's supposed to work just plug & play (as it does perfectly in the old mac).

Tested in Facetime, Photobooth and Skype. All gets the same no camera connected (but audiometers do respond to its micro.