The electrician you met was right...you need to install a vga card in your lcd and a dvd changer with that then you can play and watch videos on your lcd. And the cost he quoted you for the card is reasonable. And no, you cannot install any Pakistan map in this navigation system.
And your 'OD' button on the gear lever means 'over drive'...which is basically your car's fourth gear. Keep it on. Turn it off on steep hills on ascent / descent, or for acceleration.
The 'shift lock' button on your gear console is to move your gear when the car is off. You press that button and then move the gear - else its locked.
'2' mean your car will be driving in the first 2 gears only.
'L' means 'LOW gear'...means your car will be driving in 1st gear only.
'D' means drive.
Simple as ABC.