An dieser Stelle kann man youtube-dl empfehlen (siehe github). Damit geht das noch einiges einfacher :)

matt@trilian:~$ youtube-dl http://www.nytimes.com/2016/02/12/science/ligo-gravitational-waves-black-holes-einstein.html
[NYTimesArticle] ligo-gravitational-waves-black-holes-einstein: Downloading webpage
[NYTimesArticle] 100000004200661: Downloading video JSON
[download] Destination: LIGO Hears Gravitational Waves Einstein Predicted-100000004200661.mov
[download] 100% of 405.64MiB in 02:57