Use 1 CAT5e For PIR + Axis P32 ?

I need to install an Axis P3225-LVE at a location where it's nearly impossible to run a new cable. There is already a CAT5E that was run to a PIR motion sensor which uses 1 pair.

It looks like it is possible to connect the camera using the remaining pairs (see this post), but I'm not sure which pairs are required. I'll be using a PoE switch (HP 1910 or Ubiquiti ES).

Any help would be greatly appreciated. Thanks!

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