There are other wireless SD cards that already run a Linux OS. The main problem would be to figure out how your camera saves the files (it might not save them

There are other wireless SD cards that already run a Linux OS. The main problem would be to figure out how your camera saves the files (it might not save them in a playable format right away - for example it could save most of the data but keep the key frames - necessary every so often - until the end or so, or do more processing on the video file only after recording is finished). Unless you reverse-engineer all that and work out a way to generate a playable stream out of the intermediate file, you’re out of luck.