We learned how to replace the phone screen with 2D tracking and rotoing out the fingers.

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Before and After

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NUKE SCRIPT

Firstly, I tracked the four corners of the phone from the original plate, and then created the cornerpin2D to make the replacement image moves with the phone movement.

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And then I used the Grid Warp node to align the image to adjust the perspective and to make sure the green background is covered. Lastly, I rotoed out the fingers. I used the KillSpill node to despill the green edges around the fingers, and I blurred the edges of the fingers by EdgeBlur node.