Q: I have also problem in my iphone 5s while facing wechat video to others that they cannot see my video on their phone? It software problem or iphone problem

Hello there sasiranjith,

It sounds like you are FaceTiming with other people but they cannot see your video feed. I would start by quitting the FaceTime app:

Force an app to close in iOS

1. Press the Home button two times quickly. You'll see small previews of your recently used apps.
2. Swipe left to find the app you want to close.
3. Swipe up on the app's preview to close it.

 
When you have done that restart the device and test the issue again:

iOS: Turning off and on (restarting) and resetting
 
If the issue persists, backup your device to iTunes, then restore it as new and verify that it works. 
 
How to erase your iOS device and then set it up as a new device or restore it from backups

If it does, then restore your backup to either verify it still works and the software just needed reinstalled, or isolate the issue to the backup file itself. This process should help us to isolate the issue to either hardware or software. Thank you for using Apple Support Communities, let us know how that goes!