It is alleged that Trump's words had been edited on the video and that what he said was:
"We took many people off the streets of Washington DC. They are hardcore, they are not going to be good in 10 years, in 20 years, in 2 years. They are going to be criminals - they were born to be criminals."
There was no specific reference, in this very brief extract, to Maryland or black people - but then it isn't the entire speech so it's difficult to say for certain that such matters weren't implied or words used.
In any case, I don't agree that people are "born to be criminals". I do believe that there are things in their lives that have led them towards criminality - not necessarily poverty or prejudice (though I wouldn't think those elements can be excluded) but perhaps, in addition to material deprivation, a lack of emotional support and guidance. Assuming that certain groups of people are naturally destined to be dangerous criminals will, in my view, be likely to be self-fulfilling.