[Lazarus] macOS developer files and bindings to be created

[Lars]

Hi, I noticed some of the macos lazarus implementations are incomplete
(for example AVFoundation doesn't seem to exist anywhere) so the question
is if I want to create an avfoundation library, where do I start?

First I would try to find macos header files/include files, and where are
they on my system? (Mac Newbie here!) Would I have to download XCode and
they come with it? Or have to find them elsewhere from apple web site?

And are there automatic conversion tools or it is all done manually,
typing in objectivec1 mode into freepascal and creating pascal bindings
all by hand..?