Hi,
you can find the EcoSystem
hereDownload the EcosystemBrowser Package, then in unity go to "Assets/Import Package/Custom Package and select and install the package you downloaded.
Then in unty go to Playmaker/Addons/Eco System. and click on "Eco System Browser"
Then in the searchbox write "ugui"
select and get "ugui Proxy Full"
Now go to GameObject/Ui and select "Text"
This will automatically create a canvas and a text object.
Now you can search for the action "ugui text set text" and use that instead of "set Gui Text" from the video.
for more info about ugui you can check this tutorial :
to use buttons and sliders on ugui you can check this tutorial out :
and this tutorial :