I have lost the video viewer app that was installed by default on my iPhone 6. How can I get it back?0

Hello Tozwin and welcome to Apple Support Communities.

I see you have a concern about an app to play video on an iPhone 6.

The only apps installed as part of iOS under iOS 12 (the last version that can run on an iPhone 6) are that play video are Photos for video imported to that app and the TV app for all other video.

‎Apple TV on the App Store

Redownload apps, music, movies, TV shows, and books - Apple Support

Cheers.

Here’s a tip sign in to the same iCloud account and it will be in your pitches or if you hid it then there’s a way to get it back