Export a video path as mp4 and use the document interaction controller to send it

gistfile1.m

    AVAsset *asset = [AVAsset assetWithURL:self.videoPaths[0]];
    AVAssetExportSession *export = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
    [export setOutputURL:temp];
    [export setOutputFileType:AVFileTypeMPEG4];
    
    NSLog(@"export started");
    [export exportAsynchronouslyWithCompletionHandler:^{
        NSLog(@"export done: %d",[export status]);
        
        UIDocumentInteractionController *interactionController = [UIDocumentInteractionController interactionControllerWithURL:temp];
        [interactionController setDelegate:self];
        //    [interactionController presentOpenInMenuFromRect:CGRectMake(0, 0, 10, 10) inView:self.view animated:YES];
        [interactionController presentPreviewAnimated:YES];
    }];