Without a jailbreak, no. iOS sandboxing prevents third-party apps from accessing system audio streams. To record game audio, you must use the native recorder or connect a Lightning to 3.5mm adapter with a loopback cable.
Downloading IPA files from unofficial sources can expose your device to malware. display recorder ipa
Instead of risky IPAs, consider these official options: Without a jailbreak, no
Assume you have successfully installed the IPA via AltStore. Here is how to optimize your settings. Without a jailbreak