The early Sony Alpha A7 cameras run Android (really: you could jailbreak and write your own PlayMemories apps)

https://github.com/ma1co/sony-pmca-re

https://photo.stackexchange.com/questions/59226/does-the-son...

So there must have been a way to do this at that time. (I suspect a simpler subsystem does initial boot response).

I did contemplate building something around one of the Arducam modules and an RP2350.