I think you really need money to travel. It may not be a very large amount, but you should have enough for housing, food and transportation. When I really want to travel and I don't have money, I look for where to get it or contacting a company https://compacom.com/
It's like asking can you invest in shares without money.
Clearly that's a case when you're willing to make a carrier out of travelling,when you're passionate about travelling i understand that you wanna be paid for what you love.
But initially you have to put investment of hours and little money by setting up your blog and creating a good content and believe me that's going to be worth it of you have patience.
Just like Rome wasn't built in one day your blog can't either it takes consistency.
On Tripoto you will get credits which will be redeemed,so in place of money you're using currency of tripoto it's like travelling for free if you earn it enough.