I am trying to merge 3 videos. The scenario is as follows


1. Empty bench video clip

2. Person sitting on left side of bench clip

3. Same Person but sitting on right side of bench clip


I want to end up with a video which starts with the empty bench, then the left side person slowly appears, then the right side person slowly appears whilst the other remains fully visible

The last few seconds of the completed clip showing the person sitting on both sides of the video at the same time
(its the same person)

I have tried following the video on keyframes but am not getting it to work correctly - have managed to get one person in then fading to the other but cannot get them both visible at the same time

Can someone give me a solution

thanks
Andrew