#Peertube got already mentioned, but just serving video files may already suffice. Modern webbrowsers are capable of playing videos. Some tweaking of parameters may be necessary when encoding them. Also, no frills such as dynamic adoption of bitrate/quality or high-level stuff like commenting, likes, or subtitles.
Most comments comments mention Brother, but for me, Oki is working like a charm. Using a B431dn (b/w, duplex) and a C531dn (color, duplex) with PPD files from OpenPrinting. Older models though, not sure if Oki dropped quality in favour of DRM since.
Rules of thumb: