Yes,
I was playing around with this yesterday. My hth box has sly connected, but only sd channels. I really wanted a way to add the HD stuff. So i managed to ad the hd channels in a seperate bouquet and today i will try and place the hd channels in the existing bouquets.
Im still figuring out the EPG side of the IPTV on zgemma but in theory you should be able to record as you do any other channel.