Hiya KSA88,
The Apple Support Community really appreciates that you decided to post this issue. It appears that you're having issues streaming video with cellular data. Help has arrived!
First let's have you check this section, 'Set whether cellular data is used for apps and services' in the following article:
View or change cellular settings on iPhone
See also this article: If you can't stream or watch movies or TV shows from the Apple TV app, iTunes Store, or third-party apps
If the issue persists, can you let us know if these are home videos or videos that you are streaming from somewhere? If they are streaming videos, what app(s) are you attempting to stream them from?
Keep us posted!