Mounting a Regular Dashcam as a Rear Cam

Hi all, just wondering if it's technically possible to install a "regular" dashcam to function as a rear cam. I understand the advantages in having a 2-ch camera, but I can't really afford it now. I currently have one dashcam installed already, but would like to add another to the back. Will it get enough juice? I have a Xiaomi splitter.

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