Yes,Infinix Zero 5 does support Slow motion recording. You can find its turn on toggle in camera settings.
You can check the full specs here: Infinix Zero 5
Steps to Disable App notification
1. Go to settings.
2. Then go to Applications.
3. Select the app for which you want to disable notification.
4. Tab on Show Notification checkbox.
5. Your device will prompt a message to confirm select OK and you are done.
You can check the complete specs of this phone: Infinix Zero 5