2024 Prius LE dash cam power How To?

page 23 of The Prius Prime/Maintenance manual/2023-2024 Toyota Prius Prius Prime Repair Manual/Accessories Install/SMART LED AMBIENT LIGHTING (SET-AI-3672-D).pdf included in the maintenance manual thread
Complete Gen 5 (2023+) Repair Manual Available | PriusChat
includes this info about two unused power connectors in the front console under the shifter knob area. Info about how to access this area is also provided. The instructions are for installing a smart amber lighting kit, but do disclose these two power sources. This might help you, or not.
To view the the full doc, you might want to get the document from the provider as directed in the thread noted above. Its a terra bite zipped file, needs a good unzip program to view it.
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You can buy a FiTDVR especially for the Prius.

You don't need a dimming rear view mirror, it attaches to the harness for the camera and power feeds under the mirror housing.
The kit is fantastic. I've included a picture of it here and it powers my camera (5v) and my auto dimming mirror (12v)
The housing pushes down towards the dash and there's a small plastic bit that simple slots in to cover the mirror arm. Once the harness is plugged in, just push the excess cable within the housing and use a small cable tie if necessary. Have patience with the replacement of the housing. It needs to be flat against the screen and slid upwards to engage the red clips.
Just takes a couple of goes.

 

Dash Cam Power Adapter (12-Pin) for Toyota Tacoma Camry Corolla RAV4, – FitDVR

 

Hey there, there are couple fuses underneath near your pedals, you can tap into one of those and just tuck the wire alongside your dash and up to the mirror area. Cheers!