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I have a K1 Plus android box which have a built-in dvb-t2` and dvb-s2 tuner in it. I want to create an app that gets and shows the channels from those tuners.

At first, I found about android's TV Input Framework(TIF). The sample app keeps crashing by calling a method that gets the available inputs of the device. Then, found out that it only work for real Android TVs. I looked for android libraries for that android box but didn't find anything. I looked for c libraries that can access the tuners but didn't find anything as well. I looked for code on how to access the hardware components of an android device and didn't find anything. I recently found about https://opencv.org/. I haven't read everything about it yet so I don't really know how to use it.

I found about https://git.linuxtv.org/v4l-utils.git from an answer to a SO question but it seems like it can only be used after installing it to an OS. I was able to compile it using CMake on android but it got missing header files.
I also found http://android4tv.iwedia.com. Unfortunately, it's also using TIF.

I'm trying to create something like kodi but I found out that it isn't really the one that gets the channels but kodi is getting it from a supported iptv box. I have zero knowledge about writing C but I'll try to make the code.

This is the box btw. http://www.videostrong.com/S905D+DVB(KI%20PLUS)/55.html

It will probably take a lot of reverse engineering or a leaked documentation to achieve what you are trying to do.

Devices like the one you are working on usually use proprietery hardware with proprietery drivers for things like DVB, so making a third party app for a TV tuner is very hard.

First, you need to find out what kind of DVB chip / card this Android box has.
Then, you need to figure out how (on what kind of BUS) it is connected to the system.

If it is something generic, you may be able to talk to its driver, if not, you would need to write your own driver.

This is too complicated to explain in a SO post, but you could start by opening the box and looking at the components or by running commands like lsusb through ADB to try and identify the DVB component.

If the device already has a DVB app, you could try disassembling it, to find out how it works.

Good luck!