A partial page flip effect

1

I want to cover a streaming video with semitransparent “sheet of paper” with page flip effect end when a user move the mouse over and click and drag on the edge to be able to uncover half of the movie by diagonal. Can someone help me on this, please? I’m trying to find tutorial on this in AS3 for two days but I cannot. I don’t want page flip engine or something like this, just want the effect of sheet edge moving along the mouse pointer to some point and to stop revealing of the video when reaching this point.