Khurram Bhai, I have seen the posted video closely. I am not sure that there would be exactly the same thing in Mong Kok i.e. with the proper grips having appropriate pin structure, but LEDs for interior illumination would be available.
What I have observed from this video is that there is no rocket science involved in this kit but yes a drawback of drilling holes in the car do exist. These are simple LEDs and the only difference is that they are not making a "spot" and the light is dispersing. That has been achieved with the help of the rough surfaced translucent plastic cover on the LEDs which is preventing them to make a spot.
This thing is a simple DIY which wont cost much at all. As far as the wiring is concerned, it'd be a piece of cake. The plus point could be that you can have your desired amount of LEDs placed at your desired places and you have a flexibility to make it according to your specifications so that the dash board remain un-drilled.
I and a friend of mine actually did this thing with his Daewoo and trust me, there was no spot and the end effect was exactly the same. I am posting a picture, I did this long long time ago with my Alto. The spots that you can see are there because I wanted them. The size and area of focus could be changed manually without any trouble. I did this DIY in blue and red. The picture was taken from 6600 at night so it is not that clear but you can have an idea.
Now, what I'd suggest you is that before spending money on buying this kit, just go to your regular auto accessories shop and ask him to give you the LED that they stick on the front pillar while installing a security system. That particular LED is normally enclosed in a black plastic cover with a blue translucent area. Just connect the wires to the battery (do check the voltage and ampere requirements as you'd be connecting directly) and try to hide it under the dash board. Compare its result with that you have seen in the video. If it works, I am sure you can get those LEDs with ease and connection; just a parallel connection among the LEDs and a simple joint with the parking light wire and you are done.