Position of video on layer slider

Hi guys :-)

1) I’ve put a video in one of the layers
2) It’s default position is in the the upper left corner.
3) I can’t figure out how to position the video where I want it. It’s stuck in the upper left corner.
4) I can’t move it with the mouse and I can’t see any option to position it by e.g. defining it’s position in px og % manually

Can u help? :-)

Martin