I read somewhere that Fazer FZS 600 Cam Chains do sometimes get a bit noisy before the adjuster clicks on to the next notch or whatever it is it locates in.
It could also be that the tappets/Valve setting spaces need re-shimming.
In the past I have had bikes with a slappy cam chains and it produced a noise heavier than that, but of course the sound could vary from bike to bike.
One bike (DOG) I had a few years back the cam chain was so loose that it rubbed/slapped its way through the chain tunnel and oil leaked through the hole it made (About 3 mm wide by about 8 mm long)
Better to have a chain slightly loose than a bugger to tight that's for sure.
If it is the cam chain I personally would not be in an immediate rush to do something about it, you might find in a few miles that it clicks over and the adjuster takes up the slack and it runs quieter again. But you need to make your own mind up on that decision.
Looking at what we can see of the bike in the video it looks well used, has it been maintained well? Is it a new bike to you? (New Member in FOC-U)
Anyway as someone else helpfully suggested introduce yourself in the introduction section of the forum and let see a few pics of your steed.
Oh yeah! Welcome to the nut house.
tommy