Replying to Upgrading to a more ''serious'' video camera

Hello guys , im rigth now doiing a couple videos with a Nikon D3100 ( wich got me into video making) and iI realised I really love doiing this so i may upgrade camera in a near or far futur !

So first thing i need to chose between DSLR cameras or Camcorder, i'll be filming wakeboard, skateboarding,sport,etc.., I will probably start doiing other stuff when i will be better so it's really not only for sports ! (probably goiing in film school so im gonna make amateur movie and stuff!
i have a few question about the Camcorder video cameras. I always been more interessed into camcorder for some reasons ! I think it's because the body of a good camcorder look better to handle!

so Camcorder have smooth zoom rigth ? ( I have read a thread about the ZOLLY technique and I understood that you need a automatic smooth zoom to do this rigth ? how can you do this with a DSLR ? does DSLR like 7D can have this ?

On DSLR you can change lens to have ,fisheye better zoom or Wtv but can you do this with a camcorder ? sometime i see CRAZY ASS wide fisheye camcorder in some video do I have to buy a camcorder with a fisheye(or wide angle) as a lens and not be able to film not wide shot ?

I was thinking about something like a 7D for the DSLR but i really don't know alot about camcorder so if you guys could help me out by posting your own experience and/or post some article to read about the diference and wath is the best for wath i want etc !

Sorry for weird sentence english is not my primary language !