Hi.
I am a beginner... and frankly I hate those infographics stuff, but I have no choice, being a secretary of sort and this is my boss' demand.
Ideally I should remove the background but seeing how the color's not uniform, that would have to be through selecting the shape of the person.
If you know how to do that without too much work (the person doesn't move much) this is super.

Otherwise he can be satisfied with just removing two little zones, then I'll put a colored screen.
I can rotoscopy to remove one zone but when I put another such effect, it just doesn't work, impossible to move to change the selection or it switches to the first rotoscopy or a whole of other bad, bad whatnot and I want to ‘û©ï that program.
I can't even know if it's a bug but if it's not the program is ßðîþ .

Please help.

Put the original video clip on two (or more) Video tracks, one track for each rotoscoping area you need to create

Then apply a single rotoscoping effect on each of the clips on the timeline for every zone/area you need to isolate from the rest.

EDIT: In any case.. it works even if you put two rotoscoping effect on the same clip, but you have to change the "Alpha Operation" parameter to ADD on the second effect applied (tested just now with KDENLive 20.12.3)