This is how I created the portal in a recent short film of mine. You can watch it here: https://www.youtube.com/watch?v=g40aT_MYS8U
Where I got the stock footage (the ground crack and fire elements): https://www.actionvfx.com/
ActionVFX's compositing ground crack tutorial: https://www.youtube.com/watch?v=12XoFteMyVI
Advanced Rotoscoping Tutorial:
https://www.youtube.com/watch?v=PcS58LD_Hg8
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This is my second channel! To see the effects I do on this channel in their final form, visit: https://www.youtube.com/cosmicnation
