Why is my default camera gone?

[reem elfeky]

I don't know why but suddenly the camera application kept telling me every time I open the app that "there is no apps to complete this function" and it automatically close ,I installed lots of other apps but never of them where the same I also made the factory reset twice to try to get it back but after I did it the application disappeared and couldn't find it..
my phone is Samsung note 5
Please help!!