Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Editing › Video inside Text › What you could is download
What you could is download GIMP and use that to make the block letters you need, then save them out as PNG image. This might help here – https://youtu.be/p4tPtSdSj9o
Go here to download GIMP – http://www.gimp.org/downloads/
