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This may be overkill but you can use an oscilloscope to manually calculate the baudrate, i.e. like this. It looks like it could be UART serial data, but this is a good resource to reference. Sometimes http is used as a means for communicating, and not necessarily directly to a browser see here. This is pretty common in embedded applications actually. You can try using dirbuster to see what hidden endpoints there are that may be used for video. If there's an RC, you can try and do what you were doing before on the drone for that (see what dmesg says when plugged in, check any open ports, etc). If it's a phone you connect to, you can RE the mobile app. I like using jadx for APKs to get a lay of the land. If you don't want to pop the SPI flash like i suggested earlier (and I suggest don't do that except for last resort), you can grep for firmware urls in the mobile app to see if it does OTA updates, and see if you can directly download it and analyze it with a disassembler like Ghidra. Since it's WiFi, you can also MiTM the traffic from an AP you control like your computer. I'm guessing video is probably going to be something like RTSP at an IP address, so you can grep in the mobile app for that, and that might be good enough to get your video feed honestly.