Texas Tech double bass professor Mark Morton has an active YouTube channel that should be a go-to resource for bass students. Mark previously served as the Columbus Symphony principal bassist and has also been featured on Contrabass Conversations on episodes 114 and 117.
Here’s his most recent video of the solo bass part for Pulcinella:
Other orchestra videos include:
Marc also has a ton of solo material and many etudes. Check it out–good stuff!