The LocalVideo module is supported on Windows. It will play local video files, eg an MP4 on the local drive, but a limitiation in the Windows Media Player controls available when you embed it means that network streams aren’t possible.
I’m not sure where we have documented that network streams do work on Windows? If you can point me to it I’ll raise a bug to correct that, with my apologies.
HLS streams are a sepecific stream format. You can’t pass an RTSP stream URL in and expect it to work. If your streaming device supports HLS, then enter the HLS stream URL (Normally ending in .m3u8), and the 1.8.1 Player should then work with that.
The VLC browser Plugin is part of the VLC distribution. You can design a custom embedded HTML widget to enable that in conjunction with a web browser to play a network stream. Others have done that with varying levels of success. It’s not something we can directly support you with however. Installing that won’t make the LocalVideo module work for RTSP streams on Windows.
Alternatively, there’s the Guide Peter linked you to in your other thread which may be useful: