instant ice?

i watched a 3 minute clip on utube where a glass of water was pplaced on a table.
next...salt was sprinkled into the water. then a straw was lit, placed into the water and removed after a few seconds. the water turned into ice.
is this a camera trick or true

I suspect what you are looking at is the sudden crystallization of a super saturated solution of sodium acetate.

Compare to these:

BTW, would it kill you to include a link to the original video?
Yes, it would have killed him. Probably about as quickly as typing in "www.google.com" into his address bar would have killed him as well.
Could also be supercooled water, though that tends to flash to slush rather than solid ice. There are many examples of that you YouTube too.
I think you've got it sir! If not then it's trick photography.