MicroSD to USB adapter
Before embarking on a project like uSD interface over USB, you need to understand/appreciate few things.

USB is a complex protocol, which has no direct relationship with multitude of SD cards protocols.
The 1701 IC is apparently a bridge between USB (likely FS, or maybe HS) protocol and uSD card. Looking at their &quot;schematics&quot;, the IC uses the simplest initial SPI-like protocol to access uSD data.
To get access to uSD, the IC bridge implements complex data structures that represents USB Mass Storage Class (MSC). Without the MSC your PC will not understand data/control formats.
To bridge a uSD to MSC interface, the IC must first initialize the SD interface, and then evaluate uSD card capability and file structure. This requires lengthy serial data transfers on uSD side, and analysis of card responses. Remember, there are many types of uSD cards, of various sizes and write structures, and one never knows what kind of card you will insert. So the IC bridge must be intelligent enough to recognize the particular card.
All this functionality is hidden from you inside the IC, so there is not much you can learn, unless you put USB analyzer on USB end, and SD/MMC analyzer on the card's end.
I know nothing about &quot;AB701&quot; IC, but if you try USB2240, you will need a 24MHz crystal, couple of capacitors, you can find reference design files on MCHP site.
The USB2240 embeds a 8-bit microcontroller with advanced 80C51 architecture, which runs a code from internal flash memory, which is compiled from thousands of lines of C++ code, so the chip will discover identity of plugged uSD card, and built proper capability tables to report in accord with Mass Storage Class interface.
As you now can see, the youtube video is highly misleading, by hiding all the above technicalities.
You can certainly solder all 36 wires to the QFN36 IC with tiny 0.5 mm pitch, and, if done correctly, it might work. Better, you will need to design a PCB (say, using free tool from ExpressPCB), all in accord with manufacturer's recommendations, and you will have an interface to uSD card over USB port.

Good luck.