1:26 if that cable goes into that motor as it is going into that base, it is non compliant with electrical regulations. Cant have exposed tps below 1.8m.
Probably shouldn't have those rollers on a wooden post.. or the catchers and stops on wood posts/fence either. The conduit for the cable should not have been cut flush with the ground to prevent water seeping in and should also have been sealed with silicon at least.
Gate to high off the track, wheels should be fitted internally to stop wheel's causing injury to children. You need safety edges on all sheer pionts and safety edges plus a force test for trapping danger.
"HOW TO install an automated gate" - basically in this video I don't see that how-to, all you can see is 2 guys placing a prefabricated gate on a rail and that's it for the automation get an electrician :)