The video shows 4 people in civilian clothes casually wandering along chatting while unarmed.
Putting aside the thousands upon thousands literal children Israel has slaughtered in the past few months while spewing genocidal rhetoric (because Hamas?), what evidence do you have that this isn't a warcrime and that they're combatants? The video contains absolutely nothing suggesting anything of the sort, and no evidence has been presented.
When people say they want to commit a genocide, then kill tens of thousands of civilians, I tend to believe them - why are you so incredulous?