If you have access to a Windows machine you could try something like this: https://forums.dolphin-emu.org/Thread-howto-extract-rom-from-a-virtual-console-game
Although, be aware, it may not work well with OoT. There are probably other tools that can extract an N64 ROM from the Wii WAD. Or you could just upgrade. Just saying.
Although, be aware, it may not work well with OoT. There are probably other tools that can extract an N64 ROM from the Wii WAD. Or you could just upgrade. Just saying.