The main lenders are unlikely to give you such a loan.
However, the likes of Pepper Finance or Finance Ireland might.
Best to go to a broker.
However, first you should go to the lender on your home. They should give you the loan without it affecting your tracker.
If they don't, you should seriously consider selling the investment property and being debt free. A loan secured on the investment property is going to be expensive.
And contrary to what some people think, you will not be getting any tax relief on the interest. Although it might be secured on the buy to let, the purpose was not for the purchase of the buy to let, so the interest can't be set off against the rent for tax purposes.
Brendan