Get two 12v batteries to see if the camera power up first.
Multi-connector cable:
20–28 V DC, typical 9 W, max 23 W
20–24 V AC, typical 13 VA, max 31 VA
https://www.axis.com/dam/public/f9/1f/3e/axis-p5635-e-ptz-dome-network-camera-en-US-206152.pdf
If it does power up, you have another option...