Probably not without work. Or without wholesale replacement.
This enclosure from circa 2004 would have been a Power Mac with a PPC processor, such as the G5. Not Intel. That's not upgradable, and can't run 10.7.5. So you're probably not using a 2004-era box here.
Mac Pro (Early 2008) model identifier Mac Pro3,1 and later can be updated to El Capitan, assuming sufficient memory and free space.
The earlier Intel Mac Pro boxes cannot be upgraded past 10.7.5.
Neither the Apple OpenGL support not the capabilities table indicates any support for your graphics controller (at all), which implies it'll need to be replaced. (There's no indication of support for support of an NVIDA GeForce 7900 GT with the Mac Pro, for that matter.)
Please confirm your model year and the specific graphics controller.