With those GCSE's it is certainly possible to be able to apply to a medical degree successfully- however it depends on many things, such as how you perform at AS/A2,your personal+teacher reference, and your aptitude tests.
However i would advise against applying to medical schools which place a high emphasis on the number of A*'s attained as it would appear your GCSE's are not as competitive in comparison to the cohort.However some medical schools place little (or no) weight on GCSE scores and some take into account the context in which you scored those grades (especially if you didn't go to a great school) so it is important not to give up in applying, as it is an overall application where one part being strong may compensate for a slightly weaker part.