Option to mirrorVideo for iOS

The work done by @rad182 (but he closed his pull request?) https://github.com/react-native-community/react-native-camera/pull/915

docs/RCTCamera.md

@@ -256,6 +256,10 @@ By default a <ActivityIndicator> will be displayed while the component is waitin
 
 If set to `true`, the image returned will be mirrored.
 
+#### `mirrorVideo`
+
+If set to `true`, the video returned will be mirrored.
+
 #### `fixOrientation` (_deprecated_)
 
 If set to `true`, the image returned will be rotated to the _right way up_.  WARNING: It uses a significant amount of memory and my cause your application to crash if the device cannot provide enough RAM to perform the rotation.

ios/RCT/RCTCameraManager.h

@@ -72,6 +72,7 @@ typedef NS_ENUM(NSInteger, RCTCameraTorchMode) {
 @property (nonatomic, assign) NSInteger videoTarget;
 @property (nonatomic, assign) NSInteger orientation;
 @property (nonatomic, assign) BOOL mirrorImage;
+@property (nonatomic, assign) BOOL mirrorVideo;
 @property (nonatomic, assign) BOOL cropToPreview;
 @property (nonatomic, strong) NSArray* barCodeTypes;
 @property (nonatomic, strong) RCTPromiseResolveBlock videoResolve;

ios/RCT/RCTCameraManager.m

@@ -298,6 +298,10 @@ RCT_CUSTOM_VIEW_PROPERTY(mirrorImage, BOOL, RCTCamera) {
   self.mirrorImage = [RCTConvert BOOL:json];
 }
 
+RCT_CUSTOM_VIEW_PROPERTY(mirrorVideo, BOOL, RCTCamera) {
+    self.mirrorVideo = [RCTConvert BOOL:json];
+}
+
 RCT_CUSTOM_VIEW_PROPERTY(cropToPreview, BOOL, RCTCamera) {
     self.cropToPreview = [RCTConvert BOOL:json];
 }
@@ -325,6 +329,7 @@ RCT_CUSTOM_VIEW_PROPERTY(captureAudio, BOOL, RCTCamera) {
 - (id)init {
   if ((self = [super init])) {
     self.mirrorImage = false;
+    self.mirrorVideo = false;
 
     self.sessionQueue = dispatch_queue_create("cameraManagerQueue", DISPATCH_QUEUE_SERIAL);
 
@@ -845,7 +850,10 @@ RCT_EXPORT_METHOD(setZoom:(CGFloat)zoomFactor) {
 
   dispatch_async(self.sessionQueue, ^{
     [[self.movieFileOutput connectionWithMediaType:AVMediaTypeVideo] setVideoOrientation:orientation];
-
+    
+    if (self.mirrorVideo) {
+        [[self.movieFileOutput connectionWithMediaType:AVMediaTypeVideo] setVideoMirrored:YES]
+    }
     //Create temporary URL to record to
     NSString *outputPath = [[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"output.mov"];
     NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputPath];

src/Camera.js

@@ -115,6 +115,7 @@ export default class Camera extends Component {
     onFocusChanged: PropTypes.func,
     onZoomChanged: PropTypes.func,
     mirrorImage: PropTypes.bool,
+    mirrorVideo: PropTypes.bool,
     fixOrientation: PropTypes.bool,
     barCodeTypes: PropTypes.array,
     orientation: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
@@ -142,6 +143,7 @@ export default class Camera extends Component {
     playSoundOnCapture: true,
     torchMode: CameraManager.TorchMode.off,
     mirrorImage: false,
+    mirrorVideo: false,
     cropToPreview: false,
     clearWindowBackground: false,
     barCodeTypes: Object.values(CameraManager.BarCodeType),
@@ -305,6 +307,7 @@ export default class Camera extends Component {
       title: '',
       description: '',
       mirrorImage: props.mirrorImage,
+      mirrorVideo: props.mirrorVideo,
       fixOrientation: props.fixOrientation,
       cropToPreview: props.cropToPreview,
       ...options,