Fix video height and width is undefined when playing HLS in ios #1933
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Provide an example of how to test the change
Test with HLS, example: https://bitdash-a.akamaihd.net/content/sintel/hls/playlist.m3u8
Describe the changes
As the number of video asset in player item is zero when playing HLS, we need to get the video size by _playerItem.presentationSize
####Related Issues
#1194