It doesn't seem to be supported, and I know the 'Stream > Transcode' option can be used with filters defined but I haven't found a way to use this with intermittent filters. For example Sepia at the beginning of the video then thrn to colour, and maybe the Psychedelic filter for one section. that sort of thing. Stream and Transcode just seems to let me set one filter on the whole video.
So I use a quick and dirty work around.
Open the video in VLC and pause it. Open the Tools > Effects and filters and slide it to one side then set the VLC window to a comfortable size. It doesn't need to be more than about quarter screen.
I have Simple Screen Recorder installed.
All I do is set SSR to record a rectangular area, then draw the rectangle over the video inside VLC.
ALT + R will start the recording and click play in VLC.
The various settings in SSR are pretty straight forward. Audio could be the problem for some people, but I got it working after one or two experimental clicks using mp3.
There are one or two VLC effects that can lock the recording on a low end computer like mine, but most of them work well.
I'm uploading the example on a slow connection. I'll come back and edit this with a link to it when it is finished.
https://www.youtube.com/watch?v=c3xmS-hM-Qk
It is not the most elegant solution, but it allows me to add the VLC effects easily to an Openshot edit session.