So I tried this today with a Rove 4k dash cam. I am not sure that it is correct. I definitely don't want to mess up my truck.
Here is my experience and questions/concerns.
So I have the dash cam positioned on the windshield. I ran the wire up by the bracket around the rearview mirror, tucked it at the top headliner over to the pillar, down behind the weather stripping and into the fuse box area.
I disconnected the negative first. I finally got the kick panel off which was harder than I thought and found a place for the ground wire.
I used the fuse that was mentioned by OP for the garage door opener which is always on.
I didn't realize that the orientation of the fuse mattered. I tried a few combinations of the two fuses in the same spot but turned around.
After each time, I reconnected the negative terminal and checked things.
1. the camera powered up but garage door button would not work. I turned the truck fuse around but left the add a fuse in the same orientation and tried everything again.
2. the camera powered up but garage door button would not work again.
Finally after turning them 3-4 times, finally the camera powered up and the garage door button worked.
But I noticed a couple things while sitting in the truck reading the dash cam manual.
1. I heard static briefly over the radio and the parking assist button briefly flashed on and then went off. After the first and second fuse switch, the parking assist button did this cycle several times. After the last time when I got the garage door button to work, the parking assist just flashes once and then done.
2. Normally when the truck is on and I turn it off then open the door the radio shuts off and if I close the door again there's a horn honk letting me know the key is still in the truck. This is hard to explain but it is no longer happening or working that way now.
I am going to watch it for a day or two and see what happens but was wanting to get others opinion especially if you have already done this.
Thanks for any tips or comments.