I want to stream games on Windows, but the games I want to stream aren't allowed on various streaming services, or those services require proprietary software in some capacity.
I haven't had much luck with ffmpeg and ffserver; it's very hard to configure for me.
Perhaps this is the only time I'm asking if there's a Windows alternative to something for GNU/Linux :)
Are you looking for a web frontend for RTMP that you can host? http://www.projekktor.com/ looks promising, but I have no personal experience with it.
Are the games you want to stream also proprietary software?
 - https://www.telestream.net/screenflow/overview.htm
Will check this out.
“gst-launch-1.0 v4l2src ! timeoverlay ! xvimagesink” gives you a webcam overlay.
For more info: http://wiki.oz9aec.net/index.php/Gstreamer_cheat_sheet