I created a Slider (operating as control of the video, like YouTube has at the bottom) and set the maximum (duration) and minimum values. And then used SeekToTime t
SeekToTime
pteofil's answer should be the accepted answer here.
Below is the solution for Xamarin for everyone's interested:
public override bool BeginTracking(UITouch uitouch, UIEvent uievent) { return true; }
As pteofil mentioned, you need to subclass the UISlider for this to work.