You might be able to use Rotobrush for something like this. I think it might work better.
Thank you for the reply. I tried using rotobrush however the selection of the object after drawing around it only selects a few parts. I think I might try that again if it is recommended.
side note: I manage to achieve a little bit better what I want by editing mask expansion, feels more like animating by keyframes and takes more work, but seems to get the job done, however rotobrush might be the solution then.
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Know that you can NOT use Rotobrush intuitively. Using it properly makes no sense. You must look at Rotobrush tutorials.
Thank you Dave, I'll do that!