So after a couple of hours of googling and I ended up stuck while trying to compile the Ov51xJPEG hacked driver, then after reading a little bit more I found the following forum entry with a pretty simple solution to my problem:
First I renamed the old skype executable:
sudo editor /usr/bin/skypemv /usr/bin/skype /usr/bin/skypewithoutcam
Then I created the new executable
sudo editor /usr/bin/skype
And included the following code
LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so /your-skype-folder/skypewithoutcam
That's it! enjoy your video calls ;)