Do a mask just around somebody

Hi !
Is it possible to make a mask just around somebody or around an object ? Not a rectangle around…
Thanks for your answers…

In general - No.

If the person is stationary in the video you could just possibly export a frame and edit this frame in an image editor like Photoshop, Paintshop Pro or Gimp to make a mask and then use that mask in Shotcut. But if the person is moving about a lot in the video this won’t work so well.

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My subject is moving a little bit… How can I do it in a video?
I think it may be a good idea to add this effect in Shotcut…
Thanks for your answer,