camera property Null safety

1. nertc
2. nertc
3. NERtcVideoConfig
4. camera property

NERtcVideoConfig class

1. Constructors
2. By
3. Properties
4. bitrate
5. camera
6. cameraType
7. degradationPrefer
8. frameRate
9. front
10. frontCamera
11. hashCode
12. height
13. minBitrate
14. minFrameRate
15. mirrorMode
16. orientationMode
17. runtimeType
18. The
19. videoCropMode
20. videoProfile
21. width
22. Methods
23. noSuchMethod
24. toString
25. Operators
26. operator /
27. operator ==