Initial hardware acceleration support

[JonnyBurger]

From message posted on Discord by jonnyburger

I'm also interested in enabling hardware support for decoding and encoding
especially decoding could provide speed benefits for OffthreadVideo

nothing gamechanging but some gains are possible

we need to first change the ffmpeg command to use videotoolbox

(img)

but I suppose before that works we need to compile ffmpeg with videotoolbox HW accel support

I'm kicking off a build for this remotion-dev/rust-ffmpeg-splitter#10

when it succeeds, I would be happy if there are some experimentations that people make (using Config.overrideFfmpegCommand)

I think the end product could be a checkbox "Enable hardware acceleration if possible" - like in davinci resolve
and later on it can be enabled by default, and other OS like linux vulkan can be enabled

enabling hardware acceleration is mutually exclusive with other flags like -crf so we also need to handle that

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