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IP is not the best way to do it. Smart person would post to a throwaway account verified with a throwaway email address from a coffee shop parking log with free wifi.
Like others have said you or the FBI (if they were inclined to investigate) would most likely look at the video file itself for clues like others have said.
Some photo/video formats include GPS location embedded in it as a string but it might be stripped out when posting. That's easy to find, just video yourself, save in that format and look for your GPS location string where it was recorded. Then look in that same spot in their file to see if they left one. Let's assume not.
The file itself usually has equipment, aperture, version info embedded (again depending on format). Where is defined by the format but usually the header so look there with a hex editor and it should be somewhat readable. Again if you know what version you are running (ver. 3.xx.xx) then save in that format and look for where it stores it for you or read up on that format. Let's assume that does not work either.
Look for their license # encoded using steganography. This is MUCH harder to find but not impossible especially with a known string-yours. Look for embedded equipment/version info and see if you can use that same equip to create a few videos. Then diff tool to highlight file differences between them. Armed with list of identifiers for (you), look at least significant bits of those areas with differences. Assume time will be recorded, license #. There could also be parity/crc checks encoded in areas to prevent fuzzing these to something useful.
That is about as deep as you can go. If you have their license # then the vendor can track down credit card or any other info they provided when signing up for the license.
With that info you could get creative, call the vendor, make up a story about how you don't think your license xxxx is properly registered to you (but could be one of several companies you acquired), then ask them which of your companies it is registered to so you can contact them to change it so you can renew your licenses. If there is money for them they will be *very* helpful. I might have once had all the leads being emailed to a scammer redirected this way.
In the past people knew computers were meant to be explored, the plumbing is still the most interesting part.
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