If any such device exists - I have never seen one.
Powerline Ethernet uses the mains wiring to transmit modulated high-frequency signals that can be used for network traffic. It does need the wiring to be continuous between each endpoint, so for example endpoints on different main phases interrupt the signal.
An IP camera is a low-voltage device, connected to a mains to low-voltage converter / power supply, one of the important functions of which is to isolate the output from noise and interference from the mains input. So any 'power-line like signals' would be blocked.