Many couples choose to exchange gifts and notes / letters in the morning of the wedding. A pre ceremony gift or note is a perfect way to take moment out of the whirlwind that is the pre wedding preparations and connect, albeit virtually with your partner by exchanging a gift or note / letter.
If you feel comfortable, consider letting me record you reading the letters aloud. These readings can really make a wedding film feel much more emotional and personal. If you want to keep the contents private, just let me know in advance and I can focus on the emotion rather than the words.
Planning tips:
The best time for letter readings are pre ceremony, during the bride / groom prep.
Planning in advance helps here; discuss with your videographer how and when you plan on exchanging notes or letters and be sure not to seal them. If time allows, you can have the correct person reading their own words for the final wedding video.