Won't start, only clicking sound (2008 CX-9)

I had recently bought a Mazda CX-9 (2008 model) and spent the last two days hadrwiring a Viofo dash cam using the HK3 kit. All worked fine but before I wrapped up, I tried starting the car but to my surprise, unsuccessfully. There is audible clicking sound but that's it. I suspect that it might be just a drained battery. I've unplugged all fuse taps (those were connected to SUNROOF and OUTLET RR) as well as a negative lead I bolted to chassis but still no luck. While installing the dash cam and doing other things around the car, I had door open and the cabin light was on for quite a while. I really hope it is just the drained battery. Is anyone able to confirm this? Cheers.
 

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  • CX9 starting.mp4
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