Add camera support

[kelteseth]

Hi all, thanks for this wonderful project. One thing that I'm currently searching is a library that gets me a live video feed on all platforms. The current Godot CameraFeed implementation is Apple only and people are desperate for an universal solution, see godotengine/godot#46531. One sidenote is that ffmpeg 6 has now hw acceleration support for Android https://www.qt.io/blog/ffmpeg-android

Cheers!