Video compression in composer (#4638)

Co-authored-by: Samuel Newman <10959775+mozzius@users.noreply.github.com>
Co-authored-by: Hailey <me@haileyok.com>

src/view/com/composer/videos/VideoTranscodeBackdrop.web.tsx

@@ -0,0 +1,7 @@
+import React from 'react'
+
+export function VideoTranscodeBackdrop({uri}: {uri: string}) {
+  return (
+    <video src={uri} style={{flex: 1, filter: 'blur(10px)'}} muted autoPlay />
+  )
+}