link2=soup.findAll('source', label=('1080p','720p')) # или label='1080p'
link2
Out[7]:
[<source label="1080p" lang="ru" res="1080" src="https://r420203.kujo-jotaro.com/evangelion/3.1080.3e31d37bc4cef76b.mp4?hash1=be8049787056e7738662626b278da4dd&hash2=62a66b9265a79ec0e8299525e33b91ca" type="video/mp4"/>,
<source label="720p" lang="ru" res="720" src="https://r420203.kujo-jotaro.com/evangelion/3.720.c4258d66438b67df.mp4?hash1=85d66d38ea91c797807f15164e9c7c6f&hash2=c044017832e918ae2f231a52b329261d" type="video/mp4"/>]
link2[0]
Out[8]: <source label="1080p" lang="ru" res="1080" src="https://r420203.kujo-jotaro.com/evangelion/3.1080.3e31d37bc4cef76b.mp4?hash1=be8049787056e7738662626b278da4dd&hash2=62a66b9265a79ec0e8299525e33b91ca" type="video/mp4"/>
link2[0].get('src')
Out[9]: 'https://r420203.kujo-jotaro.com/evangelion/3.1080.3e31d37bc4cef76b.mp4?hash1=be8049787056e7738662626b278da4dd&hash2=62a66b9265a79ec0e8299525e33b91ca'
Если через watch_additional_players
link.findAll('span')[0].get('data-player-1080') #или другой плеер, или возможно регексп или список тут как-то использовать
Out[20]: 'https://r208.kujo-jotaro.com/evangelion/3.1080.3e31d37bc4cef76b.mp4?hash1=f6957893c06e27e323f043075007f4cf&hash2=081c50cf272c6118adab7d27440958f8'