Of course. It's basically just a set of instructions enclosed in an element that specifies where they should apply.
The <DirectoryMatch></DirectoryMatch> element is the container that you put your directives into, and the expression in the opening tag of the element specifies where they should apply. To use <DirectoryMatch>, you'll need to learn about Regular Expressions. For simple situations, however, you can use just the <Directory> element which just matches literal strings. You can read more about them from their manual page sections. In the case of the one I've posted, it means that the enclosed directives should apply to any directories whose path starts (from the root) with /usr/local/apache2/htdocs/ and has a directory name beginning with closed_ and then one or more characters that are not the / character.
All but one of the directives inside the <DirectoryMatch> element are about authentication. You can learn all you need to know about setting up authentication from the Apache manual section: Authentication, Authorization and Access Control
The example I posted is about as simple as you can get. AuthType is used to specify which authentication mechanism is to be used. In this case, Basic. AuthName is like the name of a realm. If you have another part of your site that requires authentication that has the same AuthName, then if someone authenticates themself in that part, they will automatically be allowed into this one and vice-versa. AuthBasicProvider indicates the source type of the data used for authentication. The default is file, but if you are willing to put in the extra effort, you can use databases instead. AuthUserFile is just the path to the file containing the authentication details, and Require user stephen specifies that only the listed user(s) may be authenticated for directories that this block applies to (as opposed to a group of users).
All of the directives so far are related specifically to basic auth and have no direct connection to SSL/TLS, though. Just as the remaining directive--SSLRequireSSL--is concerned with SSL only and has no direct relevance to basic auth (although the two are very commonly combined just like this). Specifying SSLRequireSSL in a block will cause Apache to refuse any request for a resource that falls within the scope of the <Directory>, <DirectoryMatch>, <FilesMatch> etc. element unless the connection is encrypted.