HippoVideo has been around for a while and they continously surprise me. You're able to send personalize videos via email (cold emails, marketing, 1:1) and track performance at a granular level, embed them on a custom landing pages, annotate, personalize GIFs and much more. They have a strong R&D team behind them that really understands what their customers want. HippoVideo is highly recommended for personalized video outreach.
Free plan available.