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Merge/blend two videos/compositions
I think I’m drowning in an inch of water: do you remember the union of two images with a gradient? (The web is full of tutorials, example here )
I’m trying to do this in after effects, or rather, having two video / two compositions I would like to merge them into one, the attached picture will be much more clarifying what I mean.Not having the tools of photoshop how can I get it?
Thanks so much!The attached picture I have worked in two seconds (with photoshop! I can not do it in AE), is not very precise and quite unpleasant, however I would like to get a clean job, with a real shade, avoiding the horrible line is formed in the middle.

PS For made attached picture I used two different frames found on youtube.
-Sorry for my little english-