If they've lost hydraulic pressure, they'll lose the ability to operate the landing gear.Lots of confusing information here like. The weather looks ok on that video until the last few seconds, it's like it disappears into fog. Could be a smoke source in front of the view - it is Karachi after all.
Three landing attempts with a technical issue is odd unless it's landing gear that's the problem. As is being offered every flat bit on the airfield and choosing a specific route. If your technical problem is that bad you get it on the ground as soon as possible.
Losing hydraulics can occasionally be linked to loss of an engine (and I mean that literally)
It's really too early to speculate with the available evidence.