找video的代码和event tracker找了好久，最后在slack里面openedx的channel里提问，很快就得到回复：（其实video组件是用xmodule来做的，open edx打算弃用xmodule但是目前还没有时间表，所以需要看此部分代码的童鞋，只能看下面的连接啦）
There is not very much documentation that I can find. This page provides a high level overview of the pieces: https://openedx.atlassian.net/wiki/display/TNL/Video+Module+architecture
It is indeed still an XModule. There are plans to convert all the modules over to XBlocks but I don’t believe that this has been scheduled. You can see the current roadmap here: https://openedx.atlassian.net/wiki/display/PROD/Product+Roadmap
https://openedx.atlassian.net/wiki/display/TNL/Video+Module+architecture
