Video has only sound not Video

I am happy to announce that iOS 13.5 (now available) should correct the problem. Read among the bugs fixes and improvements of this update: -> About iOS 13 Updates - Apple Support

Best of luck.

Giulio

Try these troubleshooting steps:

Force restart your 7, using the gestures provided here:--> Force restart iPhone – Apple Support

or

Install a fresh copy of iOS on your device, creating a full backup of your iPhone:--> How to back up your iPhone, iPad, and iPod touch – Apple Support then restore your device to factory settings and, in the end, setting it up as new, by following these instructions:--> Restore your iPhone, iPad, or iPod to factory settings – Apple Support

When done, check your device for videos, without restoring data from the backup. If everything is okay, restore data from your previously made backup:--> Restore your iPhone, iPad, or iPod touch from a backup

If the issue still persists, contact Apple Support and explain your problem:--> Get Support

Regards

Giulio