I recently installed the Fitcamx and it was nerve wracking to get that wire off, because it is in there very tight. I don't think it matters whether you have homelink mirror or not, you still need to remove that wire to plug into the fitcamx webcam, then plug the wire from the fitcamx into where you removed the wire.
The problem is that the the wire connection is very tight and it is located rather deep, so it is very hard to get out. Now there is no tab or anything that you need to press to release the connector. It is just very tight, and you can't really grab a hold of the small connector with your fingers. Or even with tools for that matter. If you watch fitcamx's own instruction video, the guy basically loops his finger around the wire itself to yank the connector loose, which is kind of dodgy. I ended up using needle nose pliers to grasp the wire close to the connector, and then firmly but also slowly wiggled it out of the connector. It kind of pinched the wire a bit, and took about 10 nervous seconds or pulling, but I did get it out. After that it is fairly easy to plug it into the camera, then plug the camer's pass through wire back into the connector.
Recording quality is average, but it really does look like an OEM solution, so I've been happy with the fitcamx, since it is by far the most clean looking installation. Fully plug and play too. Only took 10 minutes to install, but that 10-15 seconds spent yanking the wire out is a bit nerve wracking.