That's actually an interesting idea. If you mount it just past the track, you could shoot an IR beam across there fairly easily. It's not as immediate a notification as the door opening (unless the door breaks the beam), but catching someone entering is the main point, no?
Judging from the picture it looks like a door that just goes up and down (not much inward tilt)
Get the contact mounted then run your wire to the center and up to the top of the rollup door, then run a piece of coiled wire straight to the trusses. (you might need to add a piece of kindorf if you're not right below a truss)
Back in the old days, we used to do this sort of thing all the time. We would install window foil on the glass in overhead doors and then connect it using either a long coil cord or a disconnecting door cord . If there was a door within the overhead door, the contact switch would be connected in the same way.
Both options have their problems, but if I had to choose, I would probably use the disconnecting door cord. It will automatically pull apart if someone forgets to manually disconnect and opens the door, but if this happens too often, the cord will eventually wear out and gave to be replaced.
I would personally stay away from using something like the Magnum Shooters on an overhead door. Most doors of this type are sloppy and I think it would be difficult to get a consistent alignment of the contact points.
The biggest problem I have seen with coiled cords is that they tend to get tangled in the tracks of the door and get pinched by the rollers. As Undisclosed 3 said, this door looks like it goes pretty much straight up, so tangling could be less of an issue here.
thousands and thousands of thick coil cord used for many years. As for wireless, the batteries loosen when jarred a lot. Pull cords are used for fire OS/Y tampers as well, but only pulled a few times a year for testing.
Use a curtain motion from Visonic CH1D, we've used them for a while now. And lots of them. Mostly in-front of sliding doors that are prone to have door contacts broken. Almost any door contact you put on this is going to fail.
I would use an GRI 8297 gate kit to mount to the door track. Mount one set of contacts to the garage door, up and down. The other set to the man-door. Hook them up in series. If either door opens, you will get a notification. If the garage door opens, you will get a notification for both doors. If the garage door is down and the man-door opens, you will only get a man-door notification. Without using wireless, I don't think you are going to get all the way home.
So, the coiled cord connects to the top of the rolling door, connecting it to the roof typically. It's important that the cord is clear of obstacles. You run wires from the top of the door to a door contact for the inside door. A traditional OHD contact is run for the roll-up and I have seen people put the OHD contact on the rolling door, but most run it separate. When installed right, with some strain relief it lasts forever. I've seen cords that were installed in warehouses in the 50's.