Why didn't you read and click on the description link,
Remaking the charger at 220 volts
(Instructions how to translate those russian subtitles to english: Press CC button, press russian, choose translate captions, choose english, done)
it has russian subtitles AND he shows how to hack it. AND youtube can translate the russian subtitles to english.
Even if I didn't know russian and this didn't have any subtitles it would be relatively easy to do the hack.
Basically change resistor to match your input voltage, the charger already has this built in because they change few components for different markets. Change capacitors to match 400V which is typical for 230V operated switch mode power supplies, check to see if protection components can withstand the higher voltage. You could probably take old working computer power supply apart and get the necessary parts from there.
Remember safety if the device has been switched on recently, 200V or 400V capacitors can hold lethal charges so be sure to discharge them and short them to make sure. Even if it's not lethal don't touch them anyways.