fixes an issue that could result in a crash when picking videos from gallery on iOS 13 or above

Author: Miguel Ruivo

packages/image_picker/ios/Classes/ImagePickerPlugin.m

@@ -241,6 +241,16 @@ - (void)imagePickerController:(UIImagePickerController *)picker
     return;
   }
   if (videoURL != nil) {
+    if(@available(iOS 13.0, *)) {
+        
+        NSString * fileName = [videoURL lastPathComponent];
+        NSURL * destination = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:fileName]];
+        
+        if([[NSFileManager defaultManager] isReadableFileAtPath: [videoURL path]]) {
+            [[NSFileManager defaultManager] copyItemAtURL:videoURL toURL:destination error:nil];
+            videoURL = destination;
+        }
+    }
     self.result(videoURL.path);
     self.result = nil;
   } else {