Will jailbreaking my iphone let me get apps that need higher ios?

I have an iphone 4 with ios 7.1.2 and i noticed that a lot of apps require ios 8, so as the question says is it possible?

Nope.
You can, however, install App Sync and download the last version of the app that works on iOS 7.1.2 (If available).

No. Even if you could, the only way would be to install iOS 8 which would then make your iPhone 4 run far too slowly to be useful which is precisely why the original 4 never got any higher than iOS 7.1.2. Most struggle on iOS 7 anyway so I kept mine on iOS 6 until I finally upgraded to a later model.

I don't think you understand but those apps NEED IOS8 they WILL NOT work with an older operating system.

Nope. The ROM is permanent and non-changeable. It determines what iOS you can use and 7 is it for that model. (My 3 GS maxes at 6.1.6) The 4S can go to iOS 9, but many apps won't work on it because the ROM doesn't support the things the apps need.

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