For keying, compositing, and animation pros video designer use Adobe After Effects application but if you are occasional or semi pro user you can use 011.video online editor to make stunning video very, very, very easily.
How to make visual effects by pasting a transparent image shape over a video ?
- Upload a first video that you want to insert a transparent background shape
- For a short video right-click on the video control and set the loop attribute ON
- As you want to paste an image as a shape who makes the video background transparent click on visual-effects button
- Click on the scissor hand button
- Upload a picture who must be an alpha channel PNG image so that edges draw a shape
- Move this image over the video
- Click once to freeze image position
- Record your video with the transparent background shape over
- Click on pause
- Download your 011.video.webm file
- Upload a second video as a background
- Upload 011.video.webm file made before as an overlay
- Record your video
- The background video appear through the transparent shape of the front video