You can start with a leak down test and you can do it cold if you have to.
Put the compression tester in cylinder #1 and crank it over with the kill switch on to build up compression.
If you have a cracked head or head gasket you will see the compression drop rapidly.
Repeat for the other 3 cylinders in order (in order is easier to keep track of which ones you've done).
That being said, I just watched your video and when your camera shows the sunlight in the doorway, that looks like oil smoke to me, not condensation.
If you have a blown head gasket it is very easy to distinguish. Burning antifreeze has a very distinct sweet smell. Since you said you only have water in it, there is no way the condensed water would still be lingering in the doorway like that.
If that is kilometers that bike has like 55K miles on it which is a lot. Not trying to be critical of your bike, but it looks like those have been 55K hard miles. ;-)
I think you are just looking at a worn engine. You can try running it for a while and see if it clears up. If it is either worn rings/cylinders or valve seats the compression test is gonna tell the story.
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