Jumping in here many years later, but perhaps someone is in need of a solution for class / lab. Available in the apt repo is youtube-dl, install that and then google or use the man page to figure out how to use it. There will be no need to have a bunch of VMs that are powerful enough to connect to YT and stream video. Honestly any remote software is going to struggle with that. Use the util to download the needed videos to the VMs. Then play the video using a media player. The video and audio will most likely lag. However, it should be much less lag than loading web browser and all the YT web page render itself takes a ton of ram and CPU.
Disclaimer - Only use this tool to DL non copyrighted educational materials. Powerful tools = powerful responsibility.
Do good. Hope this helps!