Your solution didn't work, I deleted and re-added the CalDav account again, even checked my password on my MBP, but now I can't sync my Google Calendar via CalDav with my Ipad3 running IOS8. Even toggled the SSL option, still nothing...WTF Cook?
Mine seem to be working fine. I have a Google calendar account with a few personal calendars and a number of subscribed calendars that are connected via Exchange as i have an iPhone 5 that was setup prior to Google turning it off. I made a change in one of my personal calendars earlier and its updated in both the main apple calendar app and Calendars 5 that i use in the main.
I was having this problem as well. Thanks to this thread I was able to fix it.
Seems like something has changed in iOS8. Everytime I tried to setup my google calendar on my phone by following Google's instructions, the app generated password wouldn't be accepted.
By setting it up as a CalDAV account instead it worked first time!