I want to use the tracker (TLD tracker, MIL tracker, in particular) module in 3.0-dev, which is mentioned in the doc.
However, I can only find 3.0-alpha and 3.0-beta pre-built frameworks for iOS in sourceforge, none of which contains the tracking API I would like to use.
I am a little confused where the 3.0-dev framework is? If there is no pre-built framework for iOS, where can I find the 3.0-dev source and the instruction to build my own?
The tracking component in OpenCV is actually located as an external component and you should specifically add it when building your OpenCV Library.
You should look at installing OpenCV with contrib_modules there is a little explanation on how to do so there.
I have succesfully managed to install it on a win10 computer running visual studio. Unfortunately, I find the implementation of TLD in OpenCV 3 insufficient : it performs very slowly compared to other tracking implementations (OpenTLD...)
Good luck !