I've done a funnel before, but have not tried to suck it up again
Basically you have to mouth inhale only to keep the vapour vs air concentration high - then blow out the vapour from your mouth very slowly over a flat surface. It will pretty much just hang there, close to the surface.
Obviously you want to do this in an area without drafts of any kind
Then you take your hand like the dude does and hold it close to the vapour and flip it upwards - this is the tricky part to get right, but with some practice it works out quite well.
Once you have the tendril of vapour coming up, you can start spinning your hand around it to get the tornado like effect
For me it is kinda hit and miss, sometimes it works and sometimes it doesn't
