[zoom] new extractor

[insaneracist]

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What is the purpose of your pull request?

• Bug fix
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---

Fixes #107
Original pull request: https://github.com/unqueued/youtube-dl-prs/tree/pr/24751
I think the password field detection needs updating, however it downloads public videos.

[someziggyman]

seems to be working fine with all the Zoom links I've tried. Public and a couple password protected. Good job!

[insaneracist]

shouldn't this extractor be called zoom rather than zoomus?

[blackjack4494]

shouldn't this extractor be called zoom rather than zoomus?

yup

[someziggyman]

While this awesome extractor seems to be working fine, I've come across this password protected link today and it seems to have some custom theme on the page. Extractor does not see or identify it as one it can handle. Don't have a password to it yet to test if it works with --password parameter forced.

https://shopify.zoom.us/rec/share/J_bW4XEaoXCiUUP-oJjnMKF48xFhF8PMBJes_8pcLWqr8P3b1Xf0ljwz06Wxk2j5.N5Ed9tm6fJNI5BxA

Please see the log below:
_./testdlc -F -v https://shopify.zoom.us/rec/share/J_bW4XEaoXCiUUP-oJjnMKF48xFhF8PMBJes_8pcLWqr8P3b1Xf0ljwz06Wxk2j5.N5Ed9tm6fJNI5BxA
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-F', u'-v', u'https://shopify.zoom.us/rec/share/J_bW4XEaoXCiUUP-oJjnMKF48xFhF8PMBJes_8pcLWqr8P3b1Xf0ljwz06Wxk2j5.N5Ed9tm6fJNI5BxA']
[debug] Loading archive file None
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dlc version 2020.10.25
[debug] Python version 2.7.16 (CPython) - Darwin-19.6.0-x86_64-i386-64bit
[debug] exe versions: none
[debug] Proxy map: {}
[generic] J_bW4XEaoXCiUUP-oJjnMKF48xFhF8PMBJes_8pcLWqr8P3b1Xf0ljwz06Wxk2j5: Requesting header
WARNING: Falling back on generic information extractor.
[generic] J_bW4XEaoXCiUUP-oJjnMKF48xFhF8PMBJes_8pcLWqr8P3b1Xf0ljwz06Wxk2j5: Downloading webpage
[generic] J_bW4XEaoXCiUUP-oJjnMKF48xFhF8PMBJes_8pcLWqr8P3b1Xf0ljwz06Wxk2j5: Extracting information
ERROR: Unsupported URL: https://shopify.zoom.us/rec/share/J_bW4XEaoXCiUUP-oJjnMKF48xFhF8PMBJes_8pcLWqr8P3b1Xf0ljwz06Wxk2j5.N5Ed9tm6fJNI5BxA
Traceback (most recent call last):
File "./testdlc/youtube_dlc/extractor/generic.py", line 2387, in _real_extract
doc = compat_etree_fromstring(webpage.encode('utf-8'))
File "./testdlc/youtube_dlc/compat.py", line 2562, in compat_etree_fromstring
doc = _XML(text, parser=etree.XMLParser(target=_TreeBuilder(element_factory=_element_factory)))
File "./testdlc/youtube_dlc/compat.py", line 2551, in _XML
parser.feed(text)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1659, in feed
self._raiseerror(v)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1523, in _raiseerror
raise err
ParseError: syntax error: line 1, column 0
Traceback (most recent call last):
File "./testdlc/youtube_dlc/YoutubeDL.py", line 830, in extract_info
ie_result = ie.extract(url)
File "./testdlc/youtube_dlc/extractor/common.py", line 532, in extract
ie_result = self._real_extract(url)
File "./testdlc/youtube_dlc/extractor/generic.py", line 3382, in real_extract
raise UnsupportedError(url)
UnsupportedError: Unsupported URL: https://shopify.zoom.us/rec/share/J_bW4XEaoXCiUUP-oJjnMKF48xFhF8PMBJes_8pcLWqr8P3b1Xf0ljwz06Wxk2j5.N5Ed9tm6fJNI5BxA