How to slow motion video or a speed up video very easily with the computer mouse wheel ?
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Upload
your video file, play ▶ the video a little bit and pause 
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Double click inside and type over the canvas the video title.
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Record
and pause before to slow motion video. -
Hover the upload video icon
and use the mouse wheel 🖱 to reduce the speed from 1 until 0.1 -
Record
and pause before to do a speed up the video playing. -
Hover the upload video icon
and use the mouse wheel 🖱 to speed up the video from 1 until 10 -
Record
pause then download your video
Here is the video example with first a slow motion followed by a speed up of the video :