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As of 5/6/2015, R* has officially updated there EULA and states that any mod (Graphical or game changing) will get you banned from GTA 5.
Quote taken from the thinkcomputers thread,
"You agree not to: [..] reverse engineer, decompile, disassemble, display, perform, prepare derivative works based on, or otherwise modify the Software, in whole or in part;"
Potentially what the EULA states is that any modification made to the game folder, whether that be a trainer, graphical enhancer, or other tool to "modify" GTA 5 will get you banned.