Before you jump on the bandwagon, consider the following tips to make an effective and good video testimonial:
Take some time and find a satisfied customer who is ready to share their journey with you happily.
Don't write scripts for customer review videos. Be original and share the genuine opinion of your client.
When writing questions, choose exploratory and open-ended questions.
Look for a well-lit, uncluttered and pleasant place to record your customer's interview.
Find or record visually engaging inserts to make client testimonial videos more interesting.