Removing background for YouTube video
Easiest way is to use a greenscreen. This can be done with household items, but will be a lot easier with equipment of about 150$.

You hang a green cloth behind you, light it up good and evenly.

Then in an editing/streaimng software you simply use the Grenn Screen/Key/Chroma Key tool.

There are cameras which can do it too, but those are expansive and don't work as well.