Hi YaoXue ,
We have some docs on it here (general HW syncing), but it's not that popular, so we haven't yet wrote full tutorial on how to use it. I have heard that a few companies designed their own M8 connector syncing equipment, and that's about it. We will also be developing something similar to this:
But we first need to update the current HW revision to be able to support it. For genlock (bnc coax) you'd need to develop a similar board as above. So overall it's possible, just not a plug&play system (yet)🙂 Thoughts?