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While mine died in a bad launch for years I used one of these and swear by them. Able to use wifi on your phone to connect to it to see live video and start/stop it recording to the SD card inside of it. Fun secondary use is if you use a wifi analizer app on your phone you can use the wifi signal as a tracking method too. https://www.amazon.com/HiSpyCam-Camera-Security-Cameras-Wireless/dp/B0DB25THL7
Oh snap, looks fun! Maybe you could squeeze a camera in there, just above the pressure vessel? Cut a hole in the side, make sure it’s centered by mass. It would be hard to transmit the feed tho, that’s adds a lot of complexity, best bet would be to record, if you do want to transmit I’ll bet the lightest way to do it is by using an esp32 and transmit via WiFi, you’ll have to be close and be decent at coding for that. Check this out too! https://a.co/d/6PPmfRV