Add support for canvas video output. #11227

Job	Run time
build_js	2m 2s
pre-commit	5m 53s
build_details	2s
build_opam (4.14.x)	7m 52s
build_win32 (x64)	7m 6s
build_posix (debian_trixie, amd64)	16m 21s
build_opam (5.1.x)	7m 57s
build_no_depopts	5m 34s
build_posix (debian_bookworm, amd64)	14m 34s
lezer_parse	50s
build_posix (ubuntu_oracular, amd64)	14m 24s
run_tests (@citest)	8m 52s
tree_sitter_parse	48s
build_posix (ubuntu_noble, amd64)	13m 5s
run_tests (@doctest)	5m 25s
build_posix (alpine, amd64)	11m 23s
run_tests (@mediatest)	8m 48s
update_doc	0s
fetch_s3_artifacts	19s
build_docker (amd64)	2m 7s
build_docker_minimal	0s
build_docker_alpine	0s
update_release	0s
build_docker_alpine_minimal	0s
build_docker_release-minimal	0s
build_docker_release	0s
	2h 13m 22s

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