It's easy with the sena bluetooth audio pack, I have vids on how to hook it up to a camera that is newer than a gopro 3/4. But the audio pack only allows me to record HD audio for everyone if I use a sena 20s evo, it won't allow multi HD audio on any other sena. So I would now skip this if you are using sena mesh.
So now I'm using a Sena 50R, it's actually easier to wire up any sena with a base, 50s/30k/20s/20sevo. What you do it plug a dual splitter into the sena headphone out, then put one line into your headset then one line into the camera. This works great for a multi vlog, but if recording solo you need sidetone enabled. You can wire around this by adding a stereo breakout splitter pre camera(gopros record stereo external audio) using another mic. It records sena audio on one channel and your audio on another. You can edit the levels in post if needed. Now, if you have a DJI cam like me that only records one audio channel, I'm forced to trick it into sidetone while solo vlogging. I keep a stripped down sena 20s in my pocket off a base with no mic connected, as long as its paired I have sidetone. My favourite DJI cam is finicky with input levels so I'm running an attenuator before it, that was the last major improvement.
I don't have any vids of the latest setup, but soon I hope. It's not done snowing here.