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• what is the operator >> doing?

  in c++, you can "overload" operators, to add new functionality. in the same way, you can write something to cout using cout << mystring , you can write to a filenode using fs << "K" << 17, and read it back using int n; fs["K"] >> n; (maybe you can think of it as a primitive database / key-value store)

• there is a "const" ..

  this means, that the FileNode is not altered by reading from it.

you might want to take a look at the tutorial

• What does this description mean?

  a FileNode can hold either a single item (a number, string, or Mat), or a list of such items

• what is the operator >> doing?

  in c++, you can "overload" operators, to add new functionality. in the same way, you can write something to cout using cout << mystring , you can write to a filenode using fs << "K" << 17, and read it back using int n; fs["K"] >> n; (maybe you can think of it as a primitive database / key-value store)

• there is a "const" ..

  this means, that the FileNode is not altered by reading from it.

you might want to take a look at the tutorial