1st Option : Modify the video file uploaded.
In "VOD" > "Video library" > Click on the "pen" icon on the video of your choice.
At the bottom of the form, click on "Change the video".
Choose the type of way to upload and repeat the process done during the first uploading.
2nd Option : Duplicate the video.
Bsport also offers you the option of duplicating a video already existing, in order to be able to upload another similar file.
Click on the "duplicate" icon of the video desired.
The copy appears at the left of the screen. You can click on the "pen" icon to modify the information then on "Draft" to upload the file/link video.
If you need more info on the VOD, please see this section !