Deeply virtual Compton scattering at small <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mi>x</mml:mi><mml:mi mathvariant="normal">B</mml:mi></mml:msub></mml:math> and the access to the GPD H