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Sorry to hear you’re facing problems 
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Nextcloud version (eg, 18.0.2): 19.0.4, but also appears on the latest version
Operating system and version (eg, Ubuntu 20.04): Debian 10
Apache or nginx version (eg, Apache 2.4.25): Apache
The issue you are facing:
When viewing videos with the web player, the play (and probably pause as well) is not visible, only a round or square blue background. I have found this issue on the Nextcloud demo site as well.
In case it’s related to my computer setup, I’m on Manjaro and use Firefox. I also found this issue on Android with Firefox, although a touch on the video switches to the next file, not sure if there is a possibility to pause the video.
Maybe I’m wrong and it’s just supposed to look like this, in this case I’ll just live with it…
Is this the first time you’ve seen this error? (Y/N): N
Steps to replicate it:
- Log in to your Nextcloud via web browser
- Select a video file in order to view it
- Click on the middle of the screen to pause it