Clouds Problem

We wanted to include clouds in our music video and speed it up so we could see the clouds moving, the other day we filmed in lesson of the clouds for half an hour unfortunately the footage wasn't very good because the camera was trying to focus on something and the camera kept zooming in and out. When viewing it on the video maker we tryed to fast forward it to make the clouds move but it wasn't successful. When doing this again next we need to take the focus off the camera so it works, it would also help if the weather was slightly windy so the clouds move faster as when we filmed last it wasn't windy at all.