Hi
It might be that your image doesn't have enough resolution or is too small What size is it ? What does the staff look like in the export. Post an example raw image to drop box or Google drive. Make it public and post a link here and we can take a look.
If you have screen copied some music to create your image or scanned it, it will need to be quite high definition. Saved as a jpg the stave lines and edges of notes can often look blurred (? anti-aliasing or compression artifact?) Animating these images means that the stave lines can become even worse. It is also possible that they look blurred as the resolution of the VP preview is too low and the final export might be better. You may have to experiment a bit to find the best combination..
As an example..This image of a VP project clip shows sections of a scanned manuscript added to a Video. The notes and stave are clear enough here although there is no animation. The strip of notes changing as the music is played.
Make the manuscript as Hi Res as possible.
Nat