– Even if you install it, YouTube’s backend APIs have changed. You may get “Update required” or “No internet connection” errors unless you also patch the app with a tweak like YTClassicVideoQuality or TubeFixer (from invoxiplaygames repo on Cydia).
Search for "iOS 7 IPA Collection" or "YouTube legacy iOS IPAs" to find intact, clean binaries of YouTube version 10.11.1154 or lower, which were the final versions supporting the iOS 7 architecture. How to Install the YouTube IPA on iOS 7.1.2 Youtube Ipa For Ios 7.1 2 Download
If you meant something else (e.g., "deep text" as in a hidden message), please clarify. – Even if you install it, YouTube’s backend
Safer alternatives
YouTube IPA for iOS 7.1.2 Download: How to Install YouTube on Legacy Devices – Even if you install it