Have the instance of the AVQueuePlayer that you have allocated.
AVQueuePlayer *_queuePlayer = [[AVQueuePlayer alloc] initWithItems:[MPMediaCollectionInstance items]];
With that instance, you can get the AVPlayerItem.
AVPlayerItem *currentItem = _queuePlayer.currentItem;
For the above line, please check the doc reference.
And now try the following code
NSArray *metadataList = [currentItem.asset commonMetadata];
for (AVMetadataItem *metaItem in metadataList) {
NSLog(@"%@",[metaItem commonKey]);
}
Which will give a list as follows:
title
creationDate
artwork
albumName
artist
Now you can get the value for corresponding keys. For this, you have to refer this doc too.