One fairly simple way I did it was using google drawings. Create a new drawing and type out the text you want in the correct font/color/size you want.
The important thing here is to make sure you have no background behind the text.
Then, go to file --> download as --> PNG image (.png). This is necessary, or else you will get an unwanted white background to your text.
Then, save the .png file to your desktop, and drag it into your project media. Finally, you have to drag the image, which (if your text is black) will look like a plain black image,
over the video or photo you want the text to appear over.
The final product isn't perfect and may look a bit blurry, but works for my purposes.