Is it possible to mining BTCitcoin without any capital/asset?
If you can "borrow" your mate's computer to mine altcoin and then trade it into bitcoin, then yes, it's possible. 
Day's of mining with CPU and GPU are really over. In most cases it cost's more in electricity.
You really need to look into asics. But it will take cash, you can't do it with no assets. You could also buy direct but again takes money
aren't the mining days over for most of the people at home. even if you buy asics then the question will be : how long will it take before i break even, if ever.
Well that depends on a lot of factors.. Price for electricity, using the miners for heating if you live in a cold climate. If you are a believer in that the BTC price will increase in the future.