Q: when I open camera pausess on the image of the previous 4or5 seconds

Howdy Hamidparvizi,

I understand that your iPhone's camera appears to be having trouble and getting stuck on an image. Fortunately the article linked below details a number of steps that can help restore functionality to your device.

Get help with the camera on your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT203040

All my best.