I believe Viofo said wiring it this way bypasses the cutoff, but not sure why. Maybe Viofo can confirm one way or the other. When I have some time, I'll test it.
Now I'm a bit puzzled about what the requirement is, why do we want to connect ACC to BAT?
Connecting BAT to BAT and ACC to ACC, as in the HK3 instructions, should make the HK3 work correctly with the A119 V2. The ACC may not trigger parking mode, but everything will work correctly.
Connecting ACC to +volts should override the low voltage cutoff and turn the camera on, otherwise in some vehicles you are very likely to lose the start of your journeys since alternators do not power up straight away when the key is turned to position I, or even once the engine is started, they normally take a few seconds with the voltage still low, but may take a lot longer with hybrid vehicles, hence my original comment.
If you connect ACC to BAT, where BAT is a permanently powered fuse, then yes, CaptureYourAction is correct and the low voltage cutoff can be expected not to operate, for the above reason.
I was expecting that when ACC is connected to BAT, they would be connected to a fuse not permanently powered, as in kronong's comment:
so if mentioned idea with wiring Bat+ and ACC won't work, probably gonna buy HK2 and connect to the circuit which is powered only when the car is on, deactivating parking mode.
, but he was saying that would be for the HK2.
So my recommendation is to get the HK3, set the cutoff voltage you require, and connect it up as in the instructions, with BAT to permanent power and ACC to switched power, then everything should work fine.
You can also use it with both connected to switched power, although then you will not be making use of the low voltage cutoff.