Add a moving text over a video in real time online

How to add a moving text over a video in real time online ?

1. Upload a video     which will be displayed as a background
2. Click twice over the image
3. An input text field should appear
4. Type your text inside the field
5. Click few times on the Swiss army button     to make the text bigger and to change the font
6.  Record  your video   
7. Move the text over the video as you want
8.  Wait until the end of the background video or pause   
9. Download     your video with a moving overlay text