Green Screen and mask

I have a video shot against a green screen, underneath it in the timeline I have a jpeg star shot, because the video includes things beyond the green screen I want to mask around the object and then remove the green screen inside the mask to reveal the stars but can’t find a way to do this. Help anyone?

This may help

Thanks for that, will give it a look soon, in the meantime I have found a solution should have been using crop rather than a mask but will see if the tutorial has anything else I can learn, the more techniques the merrier.

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