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On Windows, if you have Cygwin installed, you may be able to accomplish this using tail. For example, assuming the web GUI is writing packets to a file, file.pcap, run Wireshark as follows:
tail -f -c +0 -f file.pcap | Wireshark.exe -k -i -
This also works with tshark, but the output is buffered, so in my testing, it's not as real-time and responsive as it is with Wireshark.
It should be possible to apply the same technique on Linux/BSD as well.
Ref: https://wiki.wireshark.org/CaptureSetup/Pipes