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Did you leave the car in accessory mode while trying to install the dashcam?
Sounds like you just drained the battery, do you have a battery tender you can throw on to recharge it
No idea if this will work, but you may want to disconnect the battery and let all the electronics "reboot." I'm assuming you covered the obvious already and have put all of the fuses back correctly. I also have seen some folks mention that fuses that look fine actually had been tripped - so you might want to try replacing the ones you pulled with new ones
If you do go the disconnect battery route - you will want to make sure you have the radio code and if your RDX is so equipped - the navigation code.