This thread happens every season...
But no you dont have to worry. Ive taken some nasty falls while filming (Getiing landed on, trying to do a quater pipe with my camera in hand idiotic 14 year old me)) but my camera has lasted with no damage at all. Ive even had snow inside some of the mic ports and shit and nothing ruined it
Also Ive used a rebel sl1 in the pouring rain this summer so a canon 70d should be fine because it is more weatherproof