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this isnt actually that complicated. all you need to do is layer the footage and use a mask that is keyframed.
for tutorials look up masking with the pen tool. I used to use this transition when i edited COD. there are a few cod based tutorials on this subject somewhere on youtube
gotta start somewhere. good base, there are lots of people that know what they are doing, tutorails for everything you could ever want. i admit a little childish, thats why i dont do it anymore, but the editing community surrounding that game is far larger than the one around skiing