Connect to VPN
Go on to website.
Wait for website to download (may or may not happen. If it happens, may take a few minutes to do so)
Wait for video site to download (ditto - see above)
Click "Play", then pause to allow download to happen
Open new tab & browse other website while waiting for video to download (if at all).
or Go do an errand (eg wash some dishes, put laundry in the washing machine, or dryer....you get my drift...)
Go back & check if video has finished downloading.
If partial - watch whatever you can first till the video stops, then press Pause again, to allow remaining video to download.
This way, a 10 minute video may take about an hour to finish watching, if I am lucky.
Or it may not load at all.
That is the state of internet blockage in China.