I am starting to work on one big project which includes Sirikit, Game Center, Fingerprint, health kit and home kit etc. So my doubt is can I implement those features & other features which are provided by ios using the flutter..?
Yes and no - you could definitely use some and probably all of those, but you'll have to write Platform Channels. I use fingerprint for example in my app.
There may exist plugins for some of the functionality - see the flutter packages page.