ofVideoPlayer AVFoundation, setPosition can work with arbitrary frames. #1224

Job	Run time
build-msys2 (mingw64)	2m 28s
build-msys2 (ucrt64)	2m 28s
build-msys2 (clang64)	2m 26s
build-emscripten (emscripten)	2m 4s
build-ios-tvos (ios, macos)	1m 39s
build-ios-tvos (tvos, macos)	1m 27s
build-linux64 (linux64, 64gcc6)	2m 37s
build-macos (osx, xcode)	1m 6s
build-vs2022 (x64)	17s
rpi-build (armv6l, armhf, arm-linux-gnueabihf, 1)	12s
build-macos (osx, makefiles)	1m 11s
build-vs2022 (ARM64)	50s
rpi-build (aarch64, arm64, aarch64-linux-gnu, 1)	12s
build-vs2022 (ARM64EC)	1m 23s
	20m 20s

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