Hy today i want to make a composition about 1 photo and 1 video.But i canțt because in the composition work the video doesențt appear front of my picture.Please help my
video is represented by those 8 points
Your JPEG does not have transparency in it.
Create it as a PNG ( or even a psd) with "transparency".
As shooternz said, JPEGs cannot have transparency. That's basic stuff and doesn't even have anything to do with AE. You seriously need to start learning some basics...