Hi,
I can only repeat:
* leakage current: sometimes you may find it in the capacitor datasheet, but not always. It has only a small influence on botstrap capacitor size, therefore I recommended you not to care about it.
Generally how to find informations:
"Capacitor leakage current" :
* "Capacitor" is the device --> open the capacitor datasheet
* "leakage current" is the parameter --> use the "search" function to find this itim in the datasheet.
The same applies to "VIH"
* i told you "all is written in the datasheet" --> open the datasheet.
* "see VIH" --> use the search function to find the item in the datasheet.
Datasheet says "Logic 1 Input Voltage" in the "parameter definition" column.
* "logic 1" = HIGH
* "input voltage" = voltage at it's signal inputs
* the specified value is " min 9.5V"
In other words: IR2112 needs at least 9.5V at it's input to recognize a valid HIGH logic level.
A forum can not replace a good book, a tutorial, a school...therefore you need to understand that it us impossible to explain every item in detail. You need to learn the basics on your own.
Btw: the problem with IR2112 (and other mosfet drivers) input levels has been discussed here that many times. I assume more than 100 times. Read existing discussions, that's how a forum is meant to work.
And - as already written - search the driver IC manufacturer's internet sites. They provide a lot of informations, very detailed.
Klaus